IMCUnlockLite VS rePatch-reDux0

If its not setup already, yes you just install, run and choose unlock. Its recommended to disable your plugins before you do.

Else, the card is necessary for a 1000 model. My advice is to buy a used 4GB ($10-$15), setup the hack, then install imcunlock lite. This will give you access to a 1GB internal storage, similar to a 2000 model. This partition is available even if the hack is removed, so it completely removes the console's dependence on memory cards. Then sell the 4GB memory card back into the market for what you paid.

If you have an OLED, use imcunlock lite to create a internal 1GB storage (removes dependency on memory card, even when running stock).

Definitely sounds like memory card failure. Only option is to buy another memory card to run homebrew applications. Next time you might want to look into imc unlock lite; this application will create a ~1GB internal storage on your OLED (similar to a Slim). This way, if your memory card ever fails you can revert to imc0 partition as a backup.

If the Vita is a slim, you don't need an official memory card as it has a built it memory. If its a phat oled consider this. IMCUnlockLite / IMCUnlock (if your not sure what your doing stick with the lite version). This is an option, use it as your own risk.

Once you have sd2vita setup, look into IMUnlock Lite to create a small internal partition, similar to the internal partition on a Slim. This will protect you from requiring a memory card once sd2vita is setup. In fact, I know people that have bought a used 4GB from Gamestop, setup sd2vita then IMCUnlock, and returned the memory card to Gamestop.

Why turn 7z to zip. it's already a zip. Install repatch. Unpack the folders from the zip, copy them to ux0. Open vitashell, press triangle, update Live Area. Play.

[OPTIONAL] The rePatch plugin installed on your Vita (https://github.com/dots-tb/rePatch-reDux0/releases/latest) Only required if you don't want to replace any official game files.

RePatch: https://github.com/dots-tb/rePatch-reDux0

rePatch Serves as a replacement for ux0:patch; can be used to load decrypted content on 3.60+; required for use of "compatibility packs" (dots-tb)

ux0:/addcont and remove folder PCSE00065, Download https://www.mediafire.com/file/267pp53er16t289/pinballarcade.zip/file and unzip it to ux0 (remember that you have to have the newest repatch installed https://github.com/dots-tb/rePatch-reDux0/releases).

Yes, easiest way is utilizing rePatch. Here's a short overview of how to do it: https://github.com/TheRadziu/NoNpDRM-modding/wiki

You install the repatch plugin). Then you can drag these folders to your ux0, and play the game as normal.

This may be a rare case, try out the repatch redux version 2.71. Someone has problem with 3.0 and find 2.71 work better for them.

Dunno what it can be then. As a test i installed the latest repatch on my Vita wich never had repatch before. Copied over the contents of the zip and refreshed live area in Vitashell. It just works. Keep in mind there shouldn't be a pre-existing p4 golden game installed.