Update 2:
My 2nd WRX36 SysUpgrade from Stable to Snapshot then to NSS build without issues. All can boot OK.
So it is only my 1st WRX36 failed to run Snapshot / NSS build - but Stable runs fine.
Can I copy partitions from 2nd WRX36 to 1st WRX36 to make then identical? Which partitions should be copied?
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Update 1:
I tried using 23.05.3, snapshot, and the NSS custom build.
Only 23.05.3 works by writing with ubiformat to /dev/mtd18 and /dev/mtd20
Both snapshot and NSS build will brick.
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My WRX36 softbricks again.
About 1 month ago my WRX36 is running snapshot fine for months.
Then after running AttendedSysUpgrade, it softbricked.
I just recover using Serial Console to 23.05.3 OK.
Then I download snapshot again, using Luci to flash the sysupgrade image - openwrt-qualcommax-ipq807x-dynalink_dl-wrx36-squashfs-sysupgrade.bin , then it softbricked again.
Serial Console is giving this error:
cpufreq: cpufreq_online: CPU0: Running at unlisted initial frequency: 800000 KHz, changing to: 1017600 KHz
[ 1.208328] remoteproc remoteproc0: cd00000.q6v5_wcss is available
[ 1.217642] UBI error: cannot open mtd rootfs, e�[ 1.229127] Waiting for root device /dev/ubiblock0_1...
What is the correct way changing from stable to snapshot?