Chrono Trigger (U) has multiple crash bugs on firmware version 1.17a07. For instance, traveling to the End of Time with the Epoch crashes the game. The same thing happens during the aftermath of the side mission where you defeat the monster Melphyx in the desert. There is a portal you enter as Lucca, but when you press A next to it, the game crashes. On 1.17a01 these problems do not occur. As it stands now, I have to switch between firmwares to play either Chrono Trigger or Mario and Luigi: Bowser's Inside Story and it's a bitch to do that every single time. I'm using an unmodified (but trimmed) Chrono Trigger USA rom on an NDS Lite and a regular genuine DSTT. I haven't tested any of the other unofficial firmware versions.