EFI partition failed to mount!

I've recently had problems with two OCLP SSDs becoming unbootable. They both had Ventura installed. I temporarily fell back to an older OCLP Monterey SSD, I was advsed to enable TRIM in future.

Unfortunately, I haven't yet got round to enabling TRIM and formatting my latest SSD with it, then installing Ventura or Sonoma. I actually have installed Sonoma for someione else, though.

Today, I also had problems booting up with my Monterey OCLP SSD. It seemed like it was unbootable. I've been using an outdated version of OCLP on its EFI partition, in case reinstalling it made it unbootable. I finally managed to get it to boot up in Safe Mode. I decided to reinstall OCLP onto the EFI partition, Unfortunately, I got the error message

"An error occurred: Volume on disk2s1 failed to mount

If you think the volume is supported but damaged, try the "readOnly" option

(1) app='OpenCore-Patcher-4' range=0-191

Copying OpenCore onto EFI partition

Adding SSD icon

Cleaning install location

Unmounting EFI partition

OpenCore transfer complete"

I've never had this error before. Where can I find the "readOnly" option? I don't understand how being read only coould enable me to reinstall something, though.

Unfortunately, when my previous SSDs became unbootable, the pre installed macOS Disk Doctor couldn't make them bootable again.

I hope someone on here can help me!