Without AMS version check, PedroM gives "ROM call unavailable" (it doesn't say which one, though). But if the needed ROM calls were implemented, PedroM would have to use exactly the same archive format as AMS 2 and higher, because Undelete totally depends on this.

Strangely, after attempting to run the program, I also can't receive any more files (in TiEmu, at least) until I reset PedroM.