The french extended rom can be downloaded from FTP mentioned here: http://forum.xda-developers.com/viewtopic.php?t=8403
I can also provide the following CABs (extracted them from some other ROM):
I have Rover S1 which is the same as Anextek SP230
Do you know any software that would make SP230 behave like a modem over IR or cable? wmodem program is not working.