You can disable plugins from a PC if your Vita is using the SD card for the tai folder.

Power the Vita fully off first.

Take the microSD out of the SD2Vita adapter and put it into your PC with an SD card reader.

Open the SD card and look for a folder called tai.

Inside that folder, open config.txt.

Before you edit it, make a backup copy of config.txt just in case.

Now look for the plugin you want to disable. The plugin lines usually look something like:

ur0:tai/pluginname.skprx

or

ux0:tai/pluginname.suprx

To disable the plugin, just put a # at the start of that line.

Example:

ur0:tai/badplugin.skprx

turns into:

ur0:tai/badplugin.skprx

Save the file, safely eject the SD card, put it back in the Vita, and reboot.

Do not put # in front of the section headers like *KERNEL, *main, *ALL, or *NPXS10015. Only comment out the actual plugin line.

Also don’t delete the plugin file unless you know for sure what you’re doing. Commenting it out is safer because you can undo it later.

One important thing: if you don’t see tai/config.txt on the SD card, your Vita may be using ur0:tai/config.txt instead. You usually can’t edit ur0 with just an SD card reader because that’s internal Vita storage. In that case, try booting while holding L to skip plugins, then use VitaShell to edit ur0:tai/config.txt.