It came up and looked good. So I upgraded the firmware to 2.37. That went worse than the OS upgrade.
It will no longer output anything on the serial console when trying to boot.
If I hit the secondary bootloader button, it will boot on power up. Then the OS works fine.
I tried to flash the firmware again.
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firmware upgraded successfully, please reboot for changes to take effect!
I have to use the secondary boot loader again.
I downgraded the OS back to 4.17, had to use the secondary boot
loader. Tried to "upgrade" the bootloader to 2.29.
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firmware upgraded successfully, please reboot for changes to take effect!
I've tried it a dozen times now. It always says "upgraded successfully". It always fails to load the primary bootloader.
In desperation I tried
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/system routerboard settings set force-backup-booter=no
Any idea what else I can try? Is it time to send it back?
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> /system routerboard settings print
baud-rate: 115200
boot-delay: 5s
boot-device: nand-if-fail-then-ethernet
enter-setup-on: any-key
cpu-frequency: (unknown)
boot-protocol: bootp
enable-jumper-reset: yes
force-backup-booter: no
silent-boot: yes
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/system routerboard upgrade
BTW, the other RB493G, brand new, which I upgraded last night was running 4.14. I didn't pay enough attention to the firmware version prior to upgrade. At some point I noticed it had the cpu-frequency set to 100MHz. Perhaps checking the routerboard settings before a firmware upgrade is in order?