Can't be the reason. Signature's existed for every firmware on every band, yet the Band 2 and Band 3 have gotten custom Firmwares. It's just not possible to decompile the Firmware, not even with the original tools for the Microprocessor. There are, however, passages of clean text in the firmware file if you look at it with a hex editor. The part regarding AliPay, for example, is in some kind of code. Therefore I was wondering if the edits I need are possible, maybe in the resources which can be fully edited or the firmware, which can be partly edited with a hex editor.