Hi all.
RB150
/system routerboard upgrade
…
reboot
RouterBOOT booter 2.13
RouterBoard miniROUTER
CPU frequency: 175 MHz
Memory size: 32 MB
Press any key within 2 seconds to enter setup..
kernel not found
trying bootp protocol… failed
kernel loading failed
Any Idea?
Having same problem with 3.7 after bios upgrade 
Still have no physical access to location. Any known solution to this problem ?
Will RouterBOOT allow “upgrade” back to 2.12 ? Image can be found at http://www.routerboard.com/files/rb-2.12/adm5120-2.12.fwf
mangust, have you tried this?
Managed to recover RB150 into operational mode by dowgrading BIOS back to 2.12.
your choice: g - upgrade firmware
Upgrade firmware options:
e - upgrade firmware over ethernet
s - upgrade firmware over serial port
your choice: s - upgrade firmware over serial port
xmodem receiver ready, waiting for data…
press +X several times to cancel transfer
press any key to continue…
file transfer ok
writing new firmware… OK
please reboot to run new booter
MikroTik 3.6
Thank you for instruction.
It does really help me to make router alive.
However it will be great to hear official notice from MT stuff about this.
Is it safe or not to upgrade on firmware 2.13 on all other boards?
They released new BIOS version. Haven’t tried yet, because my RB150 is on remote location without console access.
http://www.routerboard.com/files/rb-2.14/adm5120-2.14.fwf
Hope this version will be included with next ROS3 release
for RB532 is only 2.12 BIOS? Thanks
just put file to root on your RB and do:
/system routerboard print (upgrade firmware: 2.14)
/system routerboard upgrade
/system reboot 
You do not need console
honzam, the issue was faulty 2.13 BIOS which caused bootup failure on RB150.
After recent experience i’m no longer willing to upgrade bios remotely without console access.
I upgrade it remotely on RB150 to 2.14 and no problem 