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FreePSXBoot
Exploit to allow loading arbitrary code on the PSX using only a memory card (no game needed)
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InfluxDB
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If you want to try recovering the saves there are two main options: 1) Connect your card to a PC (with something like a Memcarduino or a PS3 memory card adapter) and MemcardRex to "undelete" the slot. If after connecting nothing shows up, the date is probably gone for good.
If you your PlayStation doesn't have a modchip you can also use the Memory Card manager in Unirom. Just get the FreePSXBoot version into a different memory card, boot to Unirom and the manager will show all saves, even the deleted ones, if they are still on the card. Then you can put the cursor over them and choose "undelete".