Regarding the completion of the Arknights new version fix:

Use the latest version of the EFMI fixer from Banana Studios and strictly follow its repair instructions.

At the same time, use the shader fixer I have posted here (not created by me) — its usage method is the same as the EFMI fixer.

Please note that both must be used together. If your skins disappear, it is likely because you did not use the shader fixer.