Upgrading from 23.05.5 to 24.10 using this guide on device wiki page was the last thing I did before 5Ghz network stopped working. I didn't do OpenWrt's settings reset before updating because the settings are lost anyway.
I got OEM 1.0.83 firmware on purchase, global RB01 variant.
Also I flashed OEM 1.0.71 image yesterday via TFTP (and facinstall method as well) and 5G network is still not there for some reason. Smart Connection feature that combines 2.5Ghz and 5Ghz under one SSID is turned off.
Now I'm wondering is this hardware issue or some kind of firmware bug?
Here are some errors I got running OEM 1.0.71 firmware:
[ 112.103335] whnat_probe(): probe fail since whnat is full!
[ 112.103344] whnat_dev1: probe of 1020a000.wed2 failed with error -1
[ 118.540774] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.546536] [set_datcfg_ack_cts_timeout](12998): DAT config band(0) cck_timeout Fail!
[ 118.554366] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.560122] [set_datcfg_ack_cts_timeout](13009): DAT config band(0) ofdm_timeout Fail!
[ 118.568040] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.573793] [set_datcfg_ack_cts_timeout](13020): DAT config band(0) ofdma_timeout Fail!
[ 118.581797] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.587544] [set_datcfg_ack_cts_timeout](12998): DAT config band(1) cck_timeout Fail!
[ 118.595373] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.601122] [set_datcfg_ack_cts_timeout](13009): DAT config band(1) ofdm_timeout Fail!
[ 118.609065] CTS/ACK Timeout Range should between [0xFFFF:0]!!
[ 118.614814] [set_datcfg_ack_cts_timeout](13020): DAT config band(1) ofdma_timeout Fail!
[ 100.923038] mt_rbus 0000:00:00.0: Direct firmware load for mt7622_patch_e2_hdr.bin failed with error -2
^^^ I guess this error is related to 2.5Ghz
[ 100.624317] RtmpOSFileOpen(): Error 2 opening /etc/Wireless/RT2860/RT2860_5G.dat
Output of cat /proc/mtd running OEM 1.0.71
dev: size erasesize name
mtd0: 00020000 00020000 "PL_Header"
mtd1: 00060000 00020000 "Preloader"
mtd2: 00040000 00020000 "ATF"
mtd3: 00080000 00020000 "uboot"
mtd4: 00040000 00020000 "Nvram"
mtd5: 00040000 00020000 "Bdata"
mtd6: 00080000 00020000 "Factory"
mtd7: 00040000 00020000 "crash"
mtd8: 00040000 00020000 "crash_syslog"
mtd9: 01e00000 00020000 "firmware"
mtd10: 002a0000 00020000 "kernel"
mtd11: 01b60000 00020000 "rootfs"
mtd12: 01e00000 00020000 "firmware1"
mtd13: 03200000 00020000 "overlay"
mtd14: 00500000 00020000 "obr"