I have an RB493G which I upgraded to RouterOS 5.8 tonight.  The first
one went good, this one had to be power cycled.

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.  

"firmware upgraded successfully, please reboot for changes to take effect!"

On reboot, there was no text on serial console after "shutting
down".

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.

"firmware upgraded successfully, please reboot for changes to take effect!"

Nothing.  Had to use the secondary bootloader again.

I've tried it a dozen times now.  It always says the "upgraded
successfully".  It always fails to load the primary bootloader.

Any idea what else I can try?  Is it time to send it back?

-- 
Scott Lambert                    KC5MLE                       Unix SysAdmin
[email protected]

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