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Yes, loathsome, I am playing Zelda on DS-X, and it's working 100% after doing this:
1. Load the JPN ROM with DSlazy, and press "unpack" on DS lazy.
// Here the JPN ROM is either 0864 - SimCity or 1103 - Hoshigami.
2. Copy the "arm7.bin" file and paste it i.e. on desktop.
3. Now load the protected (not working) ROM with DSlazy and unpack (same as in Step 1)
// Here the protected ROM is either 1158 - Zelda JPN, 1159 - SimCity EUR, 1170 - SimCity USA or 1181 - Hoshigami USA.
4. Copy the "arm7.bin" you got at Step 1 and paste it into the folder where the unpacked protected ROM is, overwritting the "arm7.bin" there.
5. Now click "REPACK" on DSLAZY.
// It is assumed you didn't close DSlazy after unpacking the protected ROM (Step 3)
6. It will prompt you to rename it.
// A .NDS file named as you choose will be generated. This is the unprotected ROM.
7. Then put the unprotected ROM on your card and try to play normally.