After flashing Samsung S5610K handset restart problem 100% solution.
If you face a restart problem after flash Samsung S5610k and not find any solution, then just write "eprom" file on your phone.
HWK tool user open samsung tool select your S5610k model from list. Now click on write E2p button and select E2p file, then wait few minutes for write E2p.
After write your phone may will be going total dead. Now just flash your mobile with S5610KJPKJ2.ptt file and your phone will work 100%.