I have several WS-AP3915i that I just upgraded from 23.05.0 to 23.05.2. Unfortunately, all devices completely lost their settings during the upgrade.
On the last one (my spare), I managed to capture a serial log.
Upgrading
Mon Oct 9 21:51:58 UTC 2023 upgrade: Sending TERM to remaining processes ...
Mon Oct 9 21:52:02 UTC 2023 upgrade: Sending KILL to remaining processes ...
[ 274.771256] stage2 (3157): drop_caches: 3
Mon Oct 9 21:52:09 UTC 2023 upgrade: Switching to ramdisk...
mount: mounting /dev/mtdblock10 on /overlay failed: Resource busy
[ 279.671965] VFS: Busy inodes after unmount of jffs2. Self-destruct in 5 seconds. Have a nice day...
Mon Oct 9 21:52:13 UTC 2023 upgrade: Performing system upgrade...
[ 279.779435] do_stage2 (3157): drop_caches: 3
Unlocking firmware ...
Writing from <stdin> to firmware ...
Appending jffs2 data from /tmp/sysupgrade.tgz to firmware..
Mon Oct 9 21:53:08 UTC 2023 upgrade: Upgrade completed
Mon Oct 9 21:53:09 UTC 2023 upgrade: Rebooting system...
umount: can't unmount /dev: Resource busy
umount: can't unmount /tmp: Resource busy
[
Boot log - all settings gone
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.15.137 (builder@buildhost) (arm-openwrt-linux-muslgnueabi-gcc (OpenWrt GCC 12.3.0 r23630-842932a63d) 12.3.0, GNU ld (GNU Binutils) 2.40.0) #0 SMP Tue Nov 14 13:38:11 2023
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt: Machine model: Extreme Networks WS-AP3915i
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000080000000-0x000000009fffffff]
[ 0.000000] HighMem empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000080000000-0x0000000087dfffff]
[ 0.000000] node 0: [mem 0x0000000087e00000-0x0000000087ffffff]
[ 0.000000] node 0: [mem 0x0000000088000000-0x000000009fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x000000009fffffff]
[ 0.000000] percpu: Embedded 12 pages/cpu s16588 r8192 d24372 u49152
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129920
[ 0.000000] Kernel command line: console=ttyMSM0,115200n81 ubi.mtd=0 panic=30 nohlt ro BOOT_KERNEL=primary BOOT_BOOTROM="U-Boot 2012.07.19-r00020.1 (Jul 17 2017 - 17:24:13)"
[ 0.000000] Unknown kernel command line parameters "BOOT_KERNEL=primary BOOT_BOOTROM=U-Boot 2012.07.19-r00020.1 (Jul 17 2017 - 17:24:13)", will be passed to user space.
[ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 506856K/524288K available (6746K kernel code, 610K rwdata, 1020K rodata, 1024K init, 247K bss, 17432K reserved, 0K cma-reserved, 0K highmem)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] arch_timer: cp15 timer(s) running at 48.00MHz (virt).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xb11fd3bfb, max_idle_ns: 440795203732 ns
[ 0.000003] sched_clock: 56 bits at 48MHz, resolution 20ns, wraps every 4398046511096ns
[ 0.000026] Switching to timer-based delay loop, resolution 20ns
[ 0.000305] Calibrating delay loop (skipped), value calculated using timer frequency.. 96.00 BogoMIPS (lpj=480000)
[ 0.000333] CPU: Testing write buffer coherency: ok
[ 0.000391] pid_max: default: 32768 minimum: 301
[ 0.001246] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.001276] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.003291] qcom_scm: convention: smc legacy
[ 0.004497] Setting up static identity map for 0x80300000 - 0x8030003c
[ 0.004677] rcu: Hierarchical SRCU implementation.
[ 0.005284] smp: Bringing up secondary CPUs ...
[ 0.008742] smp: Brought up 1 node, 4 CPUs
[ 0.008782] SMP: Total of 4 processors activated (384.00 BogoMIPS).
[ 0.008797] CPU: All CPU(s) started in SVC mode.
[ 0.014836] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[ 0.015002] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.015036] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
[ 0.015408] pinctrl core: initialized pinctrl subsystem
[ 0.017475] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.017874] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.019253] thermal_sys: Registered thermal governor 'step_wise'
[ 0.019679] cpuidle: using governor ladder
[ 0.019741] cpuidle: using governor menu
[ 0.045842] cryptd: max_cpu_qlen set to 1000
[ 0.050595] usbcore: registered new interface driver usbfs
[ 0.050709] usbcore: registered new interface driver hub
[ 0.050775] usbcore: registered new device driver usb
[ 0.050858] pps_core: LinuxPPS API ver. 1 registered
[ 0.050872] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.050904] PTP clock support registered
[ 0.053119] clocksource: Switched to clocksource arch_sys_counter
[ 0.054437] NET: Registered PF_INET protocol family
[ 0.054715] IP idents hash table entries: 8192 (order: 4, 65536 bytes, linear)
[ 0.055849] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[ 0.055904] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.055928] TCP established hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.055996] TCP bind hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.056092] TCP: Hash tables configured (established 4096 bind 4096)
[ 0.056239] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.056312] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.056756] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.056831] PCI: CLS 0 bytes, default 64
[ 0.058937] workingset: timestamp_bits=14 max_order=17 bucket_order=3
[ 0.064960] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.064993] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.196056] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
[ 0.199556] bam-dma-engine 8e04000.dma: num-channels unspecified in dt
[ 0.199587] bam-dma-engine 8e04000.dma: num-ees unspecified in dt
[ 0.201122] tcsr 1949000.tcsr: setting wifi_glb_cfg = 41000000
[ 0.201235] tcsr 1953000.ess_tcsr: setting ess interface select = 0
[ 0.201330] tcsr 1957000.tcsr: setting wifi_noc_memtype_m0_m2 = 2222222
[ 0.201673] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.203871] msm_serial 78af000.serial: msm_serial: detected port #0
[ 0.203928] msm_serial 78af000.serial: uartclk = 1843200
[ 0.203987] 78af000.serial: ttyMSM0 at MMIO 0x78af000 (irq = 33, base_baud = 115200) is a MSM
[ 0.204030] msm_serial: console setup on port #0
[ 0.770367] printk: console [ttyMSM0] enabled
[ 0.775504] msm_serial: driver initialized
[ 0.785356] loop: module loaded
[ 0.786459] spi_qup 78b5000.spi: IN:block:16, fifo:64, OUT:block:16, fifo:64
[ 0.789144] spi-nor spi0.0: mx25l25635e (32768 Kbytes)
[ 0.794723] 9 fixed-partitions partitions found on MTD device spi0.0
[ 0.799563] Creating 9 MTD partitions on "spi0.0":
[ 0.806089] 0x0000000e0000-0x0000000f0000 : "CFG1"
[ 0.811313] 0x0000000f0000-0x000000160000 : "BootBAK"
[ 0.816072] 0x000000160000-0x000000170000 : "WINGCFG1"
[ 0.821206] 0x000000170000-0x000000180000 : "ART"
[ 0.826256] 0x000000180000-0x0000001f0000 : "BootPRI"
[ 0.830943] 0x0000001f0000-0x000000200000 : "WINGCFG2"
[ 0.836055] 0x000000200000-0x000000280000 : "FS"
[ 0.840964] 0x000000280000-0x000001fe0000 : "firmware"
[ 0.846113] 2 fit-fw partitions found on MTD device firmware
[ 0.850167] 0x000000280000-0x000000690000 : "kernel"
[ 0.856618] 0x000000684a6c-0x000001fe0000 : "rootfs"
[ 0.860926] mtd: partition "rootfs" doesn't start on an erase/write block boundary -- force read-only
[ 0.866423] mtd: setting mtd9 (rootfs) as root device
[ 0.875254] 1 squashfs-split partitions found on MTD device rootfs
[ 0.880032] 0x000000a50000-0x000001fe0000 : "rootfs_data"
[ 0.886828] 0x000001fe0000-0x000001ff0000 : "CFG2"
[ 0.947827] i2c_dev: i2c /dev entries driver
[ 0.949808] sdhci: Secure Digital Host Controller Interface driver
[ 0.951174] sdhci: Copyright(c) Pierre Ossman
[ 0.957240] sdhci-pltfm: SDHCI platform and OF driver helper
[ 0.965750] NET: Registered PF_INET6 protocol family
[ 0.968972] Segment Routing with IPv6
[ 0.972329] In-situ OAM (IOAM) with IPv6
[ 0.975979] NET: Registered PF_PACKET protocol family
[ 0.979883] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 0.985221] 8021q: 802.1Q VLAN Support v1.8
[ 0.997962] Registering SWP/SWPB emulation handler
[ 1.015397] qca8k-ipq4019 c000000.switch: configuring for fixed/internal link mode
[ 1.015736] qca8k-ipq4019 c000000.switch: Link is Up - 1Gbps/Full - flow control rx/tx
[ 1.107909] qca8k-ipq4019 c000000.switch lan (uninitialized): PHY [90000.mdio-1:04] driver [Qualcomm QCA8072] (irq=POLL)
[ 1.109103] DSA: tree 0 setup
[ 1.118605] ubi0: attaching mtd0
[ 1.120727] ubi0: MTD device 0 is write-protected, attach in read-only mode
[ 1.124692] ubi0: scanning is finished
[ 1.130711] ubi0 error: 0xc06ffbf0: the layout volume was not found
[ 1.134679] ubi0 error: 0xc0703120: failed to attach mtd0, error -22
[ �[ 1.158550] VFS: Mounted root (squashfs filesystem) readonly on device 31:9.
[ 1.160581] Freeing unused kernel image (initmem) memory: 1024K
[ 1.193339] Run /sbin/init as init process
[ 1.753649] init: Console is alive
[ 1.754053] init: - watchdog -
[ 3.014142] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 3.187661] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 3.188958] init: - preinit -
[ 4.399511] random: jshn: uninitialized urandom read (4 bytes read)
[ 4.444758] random: jshn: uninitialized urandom read (4 bytes read)
[ 4.466353] random: jshn: uninitialized urandom read (4 bytes read)
[ 4.649172] ipqess-edma c080000.ethernet eth0: configuring for fixed/internal link mode
[ 4.649916] qca8k-ipq4019 c000000.switch lan: configuring for phy/psgmii link mode
[ 4.656369] ipqess-edma c080000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 5.233138] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 7.412758] mount_root: no usable overlay filesystem found, using tmpfs overlay
[ 7.416346] urandom-seed: Seed file not found (/etc/urandom.seed)
[ 7.647492] procd: - early -
[ 7.647703] procd: - watchdog -
[ 8.295519] procd: - watchdog -
[ 8.333156] random: crng init done
[ 8.333198] random: 7 urandom warning(s) missed due to ratelimiting
[ 8.450106] procd: - ubus -
[ 8.635487] procd: - init -
Please press Enter to activate this console.
[ 9.406509] kmodloader: loading kernel modules from /etc/modules.d/*
[ 9.653846] Loading modules backported from Linux version v6.1.24-0-g0102425ac76b
[ 9.653902] Backport generated by backports.git v5.15.92-1-44-gd6ea70fafd36
[ 9.782450] PPP generic driver version 2.4.2
[ 9.784820] NET: Registered PF_PPPOX protocol family
[ 10.316081] urngd: v1.0.2 started.
[ 11.247304] ath10k_ahb a000000.wifi: qca4019 hw1.0 target 0x01000000 chip_id 0x003900ff sub 0000:0000
[ 11.247375] ath10k_ahb a000000.wifi: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[ 11.259279] ath10k_ahb a000000.wifi: firmware ver 10.4b-ct-4019-fW-13-5ae337bb1 api 5 features mfp,peer-flow-ctrl,txstatus-noack,wmi-10.x-CT,ratemask-CT,regdump-CT,txrate-CT,flush-all-CT,pingpong-CT,ch-regs-CT,nop-CT,set-special-CT,tx-rc-CT,cust-stats-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT,wmi-bcn-rc-CT crc32 6b2b5c5b
[ 11.310970] ath10k_ahb a000000.wifi: Loading BDF type 0
[ 11.431326] ath10k_ahb a000000.wifi: board_file api 2 bmi_id 0:20 crc32 d140cd7d
[ 12.718560] ath10k_ahb a000000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[ 12.718642] ath10k_ahb a000000.wifi: msdu-desc: 2500 skid: 32
[ 12.765274] ath10k_ahb a000000.wifi: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
[ 12.766223] ath10k_ahb a000000.wifi: wmi print 'free: 53252 iram: 13432 sram: 35752'
[ 12.903700] ath10k_ahb a000000.wifi: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-file max-sta 32 raw 0 hwcrypto 1
[ 14.474570] ath10k_ahb a800000.wifi: qca4019 hw1.0 target 0x01000000 chip_id 0x003900ff sub 0000:0000
[ 14.474658] ath10k_ahb a800000.wifi: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[ 14.486600] ath10k_ahb a800000.wifi: firmware ver 10.4b-ct-4019-fW-13-5ae337bb1 api 5 features mfp,peer-flow-ctrl,txstatus-noack,wmi-10.x-CT,ratemask-CT,regdump-CT,txrate-CT,flush-all-CT,pingpong-CT,ch-regs-CT,nop-CT,set-special-CT,tx-rc-CT,cust-stats-CT,txrate2-CT,beacon-cb-CT,wmi-block-ack-CT,wmi-bcn-rc-CT crc32 6b2b5c5b
[ 14.538317] ath10k_ahb a800000.wifi: Loading BDF type 0
[ 14.550624] ath10k_ahb a800000.wifi: board_file api 2 bmi_id 0:21 crc32 d140cd7d
[ 15.839342] ath10k_ahb a800000.wifi: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
[ 15.839414] ath10k_ahb a800000.wifi: msdu-desc: 2500 skid: 32
[ 15.886252] ath10k_ahb a800000.wifi: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
[ 15.887212] ath10k_ahb a800000.wifi: wmi print 'free: 53252 iram: 13432 sram: 35752'
[ 16.023028] ath10k_ahb a800000.wifi: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-file max-sta 32 raw 0 hwcrypto 1
[ 16.149868] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 38.578103] ipqess-edma c080000.ethernet eth0: Link is Down
[ 38.583056] ipqess-edma c080000.ethernet eth0: configuring for fixed/internal link mode
[ 38.583408] ipqess-edma c080000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 38.588186] qca8k-ipq4019 c000000.switch lan: configuring for phy/psgmii link mode
[ 38.600009] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 38.607721] br-lan: port 1(lan) entered blocking state
[ 38.612651] br-lan: port 1(lan) entered disabled state
[ 38.618479] device lan entered promiscuous mode
[ 38.622966] device eth0 entered promiscuous mode
[ 38.830602] jffs2_scan_eraseblock(): End of filesystem marker found at 0x20000
[ 38.830742] jffs2_build_filesystem(): unlocking the mtd device...
[ 38.830854] done.
[ 38.842912] jffs2_build_filesystem(): erasing all blocks after the end marker...
[ 41.764274] qca8k-ipq4019 c000000.switch lan: Link is Up - 1Gbps/Full - flow control rx/tx
[ 41.770801] br-lan: port 1(lan) entered blocking state
[ 41.778951] br-lan: port 1(lan) entered forwarding state
[ 41.784303] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[ 136.517547] jffs2: notice: (1905) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[ 136.910538] overlayfs: upper fs does not support tmpfile.