flash the phone with s5610k firmware with downloader with all partitions marked(this is very important to mark all partition on both sections)
then rebuild imei with z3x,and if u want to make this to 5610k again ,just flash simply wih 5610k flash files
flashloader--
S5610k With Flash Loader 7.5.3 V0.6 Lite - Download - 4shared - sahil mirza
drver --
sunstone_v5_00_0_1_whqled - Download - 4shared
bin file ---
S5610KDDLH2_BIN by sineshgsm - Download - 4shared
csc file
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1st install sunstone driver
2nd-opan flashloder
and select bin file and csc file like
important tips
this is very important to mark all partition on both sections like this image
and boot key 3+6 key with bettery(switch off) and insert c101 usb
...