Finally my Axim is back to normal again! There were 3 problems:
1. my card was actually a MMC card, that looks exactly as an the SD card ! I changed and digitaly formated FAT32 with 2k unit size.
2. the name of the nb0 file has to be DiAd_K_AximX51v_WM5_A12EN.nb0 according to the Dell img file, and NOT DiAd_K_A12_X51v_WM5_EN.nb0 as mentioned in the procedure
http://www.aximsite.com/boards/showt...ght=bootloader
3. couldn't figure out the bootloader version and I had to try both file lengths.
For me worked the 41943040 length.
It passed. Now I have again a normal life!
many thanks to ya1950 for giving me confidence!
this forum is a good thing!