Yeah this happened to me and then I found out on the interwebs that it was hard to boot up into sav files from it.
If I had my Lite I could figure it out for you but it's being refurbished and my parts haven't come yet but I will test when I get them.
I think that if you erase the nor of a game you will lose sav data.
Make sure you're using Ruldolph's 3 in 1 loader and then just try to boot from nor and psram
Heres info from another site that might just help.
====== 3in1 Expansion Pack Tool V1.7 ======
How to use the 3in1 ExpPack Tool
You may need to apply the DLDI patch for your flashcart before using this app.
Version 1.7 is pre-patched for the R4/M3 Simply.
Create a folder named GBA in the root of your memory card, and create a folder named Save inside the GBA folder.
GBA backups go in the /GBA folder. Saves will be placed in the /GBA/SAVE folder.
L and R switch between the PSRAM, NOR and Rumble screens. The Rumble screen only shows up on supported carts.
PSRAM Mode:
(A) Load the selected game into PSRAM and run it.
[start] Load the selected game into PSRAM and soft reset back to the flashcart menu.
(only works on R4/M3 Simply and DSLink) Until the power is turned off, the game in PSRAM
will be used when switching to GBA mode or using DSGBA linkage.
(B) Backup the save for the last game run from PSRAM.
(X) Backup all SRAM to SRAM.BIN.
(Y) Restore all SRAM from SRAM.BIN.
NOR Mode:
(A) Write the selected game to NOR.
(X) Start the game that is in the NOR.
(B) Backup the save from the NOR game to a file.
(Y) Restore the save for the NOR game from the save file.
Rumble Mode:
This screen has options for enabling rumble and the web browser RAM expansion.
The options on this screen will currently only work with the R4/M3 Simply and the DSLink
Select an option and press (A) to enable that feature and soft reset back to the flashcart menu.
The feature you enabled should now work for any DS game or app that supports it.
Make sure your flashcart is dldi patched before starting.
Hope I helped