While no source is 100% guaranteed without official manufacturer support, the following avenues are safer than random Google searches:
Download and install the VCOM or SPD drivers on your PC so it recognizes your phone. mobicel fendy ds firmware download free top
Wait for a "Passed" or "Success" message before disconnecting the device. Mobicel Fendy DS Firmware or Flash File (SPD *pac) - SAROMs While no source is 100% guaranteed without official
Turn off your phone, remove the battery if possible, and connect it to the PC without holding any buttons. The progress bar at the bottom will turn yellow as the flash completes. Disclaimer: remove the battery if possible