RT-AC88U Bad eraseblock

[TBolley]

After Firmware downgrade.

Whats is mean with this ?

May 5 07:05:05 kernel: Bad eraseblock 533 at 0x0000042a0000
May 5 07:05:05 kernel: Bad eraseblock 542 at 0x0000043c0000
May 5 07:05:05 kernel: Bad eraseblock 611 at 0x000004c60000
May 5 07:05:05 kernel: Bad eraseblock 693 at 0x0000056a0000
May 5 07:05:05 kernel: Bad eraseblock 814 at 0x0000065c0000
May 5 07:05:05 kernel: Bad eraseblock 815 at 0x0000065e0000
May 5 07:05:05 kernel: Bad eraseblock 906 at 0x000007140000
May 5 07:05:05 kernel: Bad eraseblock 907 at 0x000007160000
May 5 07:05:05 kernel: Bad eraseblock 924 at 0x000007380000
May 5 07:05:05 kernel: Bad eraseblock 925 at 0x0000073a0000
May 5 07:05:05 kernel: Bad eraseblock 941 at 0x0000075a0000
May 5 07:05:05 kernel: Bad eraseblock 968 at 0x000007900000
May 5 07:05:05 kernel: Bad eraseblock 996 at 0x000007c80000
May 5 07:05:05 kernel: Bad eraseblock 997 at 0x000007ca0000

[Korth]

"Bad eraseblock" usually suggests something wrong with the NVRAM. It could be failed/failing hardware, it could be corrupted firmware, it could be malfunctioning software.

First, try reset/restart the router, it might fix itself.

Next, if you still see bad eraseblocks then try reinstalling or updating the firmware, it might fix corrupted firmcode.

Finally, if you still see bad eraseblocks then you've got bad NVRAM. It has one or more "dead" flash blocks (which have exceeded the maximum number of write/rewrite cycles and no longer function properly). This might be a replaceable DIP chip or it might be soldered onboard (I don't know, I don't own this router). Alternately, it might be bad RAM or bad NVRAM controller passing corrupted data into good NVRAM, these parts are always soldered onboard. I think you might need to replace the router hardware but maybe @ASUS can offer you a better solution.

Note that many devices have wear-levelling, over-provisioning, and other built-in features which allow them to continue functioning properly even after some flash blocks erode away. A few bad blocks might be a non-issue or they might be a serious problem, depends on how ASUS built the thing.

[TBolley]

"Bad eraseblock" usually suggests something wrong with the NVRAM. It could be failed/failing hardware, it could be corrupted firmware, it could be malfunctioning software.

First, try reset/restart the router, it might fix itself.

Next, if you still see bad eraseblocks then try reinstalling or updating the firmware, it might fix corrupted firmcode.

Finally, if you still see bad eraseblocks then you've got bad NVRAM. It has one or more "dead" flash blocks (which have exceeded the maximum number of write/rewrite cycles and no longer function properly). This might be a replaceable DIP chip or it might be soldered onboard (I don't know, I don't own this router). Alternately, it might be bad RAM or bad NVRAM controller passing corrupted data into good NVRAM, these parts are always soldered onboard. I think you might need to replace the router hardware but maybe @ASUS can offer you a better solution.

Note that many devices have wear-levelling, over-provisioning, and other built-in features which allow them to continue functioning properly even after some flash blocks erode away. A few bad blocks might be a non-issue or they might be a serious problem, depends on how ASUS built the thing.

i get t his only on reboot or down/upgrade router

[Korth]

Some bad blocks on the log might not be a problem. If the NVRAM writes didn't lose any "important" data, if the router was built for reliability/longevity. SSDs often develop bad blacks (or come with some out of the factory) yet still keep operating for years. It all depends on how ASUS built this thing, only they can give you the full answer.