Out of nowhere, RB493G bricked with panic loop

RouterOS General
1 
RouterBOOT booter 2.29
 
RouterBoard 493G
 
Authorization: Passed
CPU frequency: 680 MHz
  Memory size: 256 MB
 
Press any key within 2 seconds to enter setup..
writing settings to flash... OK
trying bootp protocol......... failed
kernel loading failed
loading kernel from nand... OK
setting up elf image... OK
jumping to kernel code
Oops[#1]:
Cpu 0
$ 0   : 00000000 00000001 00000000 00000001
$ 4   : cfefb600 c11f9e00 cfcf0a20 c017bb04
$ 8   : 0000012d 00000001 0000012c cfcf0b40
$12   : 00000002 0000002c ffffffff 0000000a
$16   : cfefb600 c035c470 c017b464 cfc0bd68
$20   : 00000001 00000000 00000001 cfd15e50
$24   : 00000008 c00f85dc                  
$28   : cfc28000 cfc29db8 00430000 c017b368
Hi    : 0000001f
Lo    : 00000005
epc   : c017b360 squashfs_kill_sb+0x14/0x38
    Not tainted
ra    : c017b368 squashfs_kill_sb+0x1c/0x38
Status: 1000c603    KERNEL EXL IE 
Cause : 80000008
BadVA : 00000000
PrId  : 00019374 (MIPS 24Kc)
Process init (pid: 1, threadinfo=cfc28000, task=cfc24000, tls=00455460)
Stack : 00000000 00000000 000002a4 00000000 cfefb600 c0124a08 cfefb600 00000001
        c017b464 cfc0bd68 00000001 cfefb600 ffffffea c0125580 000000d0 c0340000
        c0124794 c03a0000 c03a5558 cfc0d990 c035c470 c035c470 cfc0bd68 c012611c
        cff3c000 ffffffea c035c470 cfd15e50 cfc0bd68 00000001 cfc0d990 c035c470
        cfd15e50 c013c1b0 d7747040 c013b590 cff3c001 00000000 00000001 cfc0bd68
        ...
Call Trace:
{cfc29db8} squashfs_kill_sb+0x14/0x38
{cfc29dd0} deactivate_locked_super+0x84/0xcc
{cfc29df0} mount_nodev+0x68/0xbc
{cfc29e18} mount_fs+0x20/0xe4
{cfc29e40} vfs_kern_mount+0x58/0xd0
{cfc29e70} do_kern_mount+0x44/0xf4
{cfc29ea0} do_mount+0x514/0x668
{cfc29ef0} sys_mount+0x94/0xe4
{cfc29f30} stack_done+0x20/0x44
 
 
Code: afb00010  8c820194  00808021 <0c049067> 8c440000  0c049207  02002021  8fbf
0014  8e040194 
---[ end trace 58e8b777d33026a4 ]---
Kernel panic - not syncing: Attempted to kill init!
Rebooting in 1 seconds..

This unit was working fine with (I believe) 6.36 until about 15 minutes ago when it just inexplicably died.

What do I do to get it back?

2

Well, it’s even worse. Attempting to do NetInstall to load 6.34.6, I get this:

Welcome to MikroTik Router Software remote installation
Press Ctrl-Alt-Delete to abort
 
mac-address: 00:0C:42:A9:0F:5D
mac-address: 00:0C:42:A9:0F:5E
mac-address: 00:0C:42:A9:0F:5F
mac-address: 00:0C:42:A9:0F:60
mac-address: 00:0C:42:A9:0F:61
mac-address: 00:0C:42:A9:0F:62
mac-address: 00:0C:42:A9:0F:63
mac-address: 00:0C:42:A9:0F:64
mac-address: 00:0C:42:A9:0F:65
 
software-id: IFTQ-0ULI key:
TJ8xql08YDr4ON9UceNaErGL254YYg2s49jS2P2bYiRO5XQqS3vb/zHUHQgrysfXqDPt0EaDf1KrOT/h
WAgcKA==
 
Waiting for installation server...
Found server at 00:0C:29:A7:4D:C2
 
Formatting disk...
 
installed first stage                                                           
                
 
Kernel panic - not syncing: Attempted to kill init!

Now we are off the air and presumably will need to wait for a replacement routerboard. We’re completely screwed, so far as I can tell.

3

Bueller?

4

looks like a memory or NAND failure to me. Both being soldered to the board, I think you’re out of luck with it.
Maybe one of the MT guys will chime in once they start their work day.

5

Just for fun.. have you pulled any miniPCI cards you have in it just to see if that helps? I would also try a different power supply.

6

There are no cards installed.

I haven’t tried an alternate power supply. That’s a good idea. I’ll do that.

The urgency has been reduced. I have a different router installed now that’s working. In other words, Mikrotik has been fired.

Recovering this unit would be useful, however, as the one thing I’ve lost is a VPN. Using this box for that would save me the trouble of setting up StrongSwan on a Raspberry Pi.