According to the manual:
III.Select file system and format the MiniSD card to FAT32 mode.
IV.Copy image file XXX.nbh to the micro SD card and rename to ATHEIMG.NBH.
V.Turn the device power off and insert MiniSD card.
VI.Press and hold Power + Camera button, and Reset button to entry Boot loader mode.
VII.Press Power button to start upgrade procedure.
VIII.Reading source code from MiniSD card.
[Note]: This process will takes 15 mins, please don’t power off the device.
IX.After finish, press Reset button to reboot.
So probably make sure its the only file on the sd (and do it exact capital letters ect)
well let me tell u tahat i have 2 divices X7510 the first one:
ROM ver. 3.29.xTep_3_00 wwe
ROM date 01/25/09
Radio ver. n/a ... the divice dosent have radio/ dosent let me install after 7%
IPL-v2. 02
ATHE400
spl-3.05.0000
on this divice dosent let me instal a radio , after 7 % it fail, and when i want to to flash the stock rom from my computer , after 10 % it fail, and i flashed from the SD following the steps u metion here , but nothing hapens after the 3 color bootscreen .
the second divice X7510 :
ROM: WM6.5.3-23153_128DPI_x7510_6.2_VICO
Radio ver. n/a ... the divice dosent have radio/ dosent let me install after 7%
IPL-v2.02
ATHE400
SPL-v3.65. OilNex
i have the same problem on both divice