DS cartridge replacement save chips

[Johnmsuphyics]

Yep, that listing should work. Just double check the chip ID to make sure it's 4mbit.

Thanks! Did the chip swap and a solder reflow today, seems to work so far.

 

[sashaJay]

Tried this with a heart gold, using the chip that you linked on aliexpress. Soldering work is immaculate. Still no dice. Game boots now but it says "the backup memory has failed" upon attempting to save the game now.

Post automatically merged: Jan 24, 2026

As @SylverReZ said you'll need an M45PE40. You can also get a LE25FW403A from the link below (I have bought from that listing multiple times without issue), though they come in a lot of 5.
https://www.aliexpress.com/item/1005004535661601.html

This did not work on heart gold. Still says that there's an error with the backup memory and the game cannot be saved.