To be more concret with the technical informations from 3DBrew (www.3dbrew.org/wiki/Flash_Filesystem):
150 MB - 500 MB = 0x09.600.000 - 0x1F.400.000, so you oerwrites parts from the twlp, firm0, firm1 and nand filesystem.
It would make more sense to replace just single partition firm0 and firm1 from a dump of a different firmware version, in hope that 3DS except it.
150 MB - 500 MB = 0x09.600.000 - 0x1F.400.000, so you oerwrites parts from the twlp, firm0, firm1 and nand filesystem.
It would make more sense to replace just single partition firm0 and firm1 from a dump of a different firmware version, in hope that 3DS except it.