Raspberry Pi Pico - Buffer I/O error with lost async page write - unable to read boot sector error

[ 3647.497271] device offline error, dev sdb, sector 260 op 0x1:(WRITE) flags 0x0 phys_seg 1 prio class 2
[ 3647.497290] Buffer I/O error on dev sdb1, logical block 259, lost async page write
[ 3647.545527] FAT-fs (sdb1): unable to read boot sector to mark fs as dirty

If you encounter this error - as seen in above dmesg output - while using a Pico (flashing different firmwares is what I have seen as the trigger) then a solution is erasing all of the flash with a special file mentioned/provided as part of the documentation which links to this flash_nuke.uf2 file and the code on GitHub. Also found here among the repositories of the Pico Keys maker.

Path to this solution when not a lot of search results for the Pi Pico buffer I/O error

I didn’t see a lot of results for this error online this Raspberry Pi forum post being one of the few (apart from mine having flags value 0x0 and using sdb1 it is an identical error message - same sector 260 and logical block 259 and inability to read boot sector) and I found the solution to the error (in form of the flash_nuke.uf2) via searching for “pi pico factory reset” and this Raspberry Pi forums post discussing the flash_nuke.uf2 as a universal firmware file suitable for Pico and Pico 2.