S5620, B5310 boot repair solution WITHOUT JTAG.
FIRST IN THE WORLD!!!!

Samsung 2g Tool ver. 3.4.0066 Update.
Just need Micro UART autoignition cable by z3x ) NOT USB

Added GT-S5620 (boot repair, repair phone with erased boot) FIRST IN THE WORLD
Added GT-B5310 (boot repair, repair phone with erased boot) FIRST IN THE WORLD

Manual:
1. Connect phone with battery via RJ45 MICRO UART auto ignition cable by z3x.
2. Press Boot button on sw.
3. Now boot repaired.

After this procedure you can switch phone to download mode and flash phone.
http://www.z3x-team.com/