Yeah maybe no save with mk2/3, but the mk4 and neo1 work great with saves. (Neo1 with Etool v.3.13 to manage saves).
Games do work, but i get the "CANNOT ERASE" or "UNABLE TO SAVE" . It seems that the game tries to find a save data of somesort and is unable. What to do , help ..
Sorry that I forgot to mention all that I know... That error is because the game in your MK1 isn't using the same save type as the ROM you are trying to play. The most common save types are EEPROM and Flash variations of different sizes. The most common EEPROM size is 64Kbit and the most common Flash size is 2Mbit. Luckily the majority of the nuked EEPROM-using ROMs happen to save perfectly fine to the GBA Flash Cart's Sram (I.E. Mario 64, WarioWare Touched, etc.) while the FLash save types usually won't write to the GBA flash cart automatically, and must overwrite one of your games that uses that type (Animal Crossing, Mario Kart DS, Star Fox Assault, and Contact just to name a few). Now there are some cases where EEPROM saves wont save to Sram either and must likewise overwrite one of your games that uses EEPROM saves. I personally use my New Super Mario Bros.
cart to boot the majority of games and never once had to overwrite its EEPROM thanks to the beautiful Sram on the flash cart, but in cases where I played ROMS that used Flash such as Animal Crossing or Contact, I had to overwrite my Star Fox Assault game cart. If this has you worried about losing data, please use the Etool that I mentioned earlier as it works about 95% of the time for me. Also, here's a wonderful little link to find what games use what saves: http://releases.pocketheaven.com/?section=ndsearch
EDIT:You arn't using an MK1, and the 2/3 don't support DS carts, or do they? I don't know much about them.
The games will work with MK3 But the problem is that you can't save the games.
I try with Super Mario 64 DS. I play a little bit and then I save. And turn the Ninendo DS off. When I turn it on again it didn't save nothing. So you will need a mk4-mini to play with that patcher.
Ok, several things. 1: Try older patchers with older games for max efficiency. I used GST patcher 3.0 for Mario 64 DS and it worked fine. 2: Sometimes those old NeoFlash carts don't like to save properly to SRAM, in this somewhat uncommon case you can use NDS Patcher v.01 with the -nosave command to overwrite one of your commercial game carts that uses the type of save your ROM uses. 3: I don't think the MK3 allows for some Flash saves, and i'm not sure if it will save to an SD unless you are using it in a Neo2/3 with an MK4. (More to it than for #3 that but I'm tired of typing and as I said I don't know much about the MK2/3).