PW5 Accidentally overwrote the shell, unable to run any KUAL software

[avaa8]

I tried messing with mounting an external drive to the Kindle without really knowing what i'm doing, and in the process attempted to move a copy of lsblk to PATH, and made an extremely stupid mistake by moving it to /bin/ash because "oh that's what pops up when a command is invalid, must be PATH". Several factory resets later, I still haven't figured out any way to access the filesystem beyond what little MTP allows, and any software in KUAL fails to launch entirely. Is there any way to force access into the rest of the filesystem or a fix in general?

[j.p.s]

Reinstall the current firmware.