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And get warranty back

If you have rooted Samsung Galaxy Ace GT5830 you can unroot it to restore/recover/return your warranty by following this simple steps:

I wouldn't recommend to unroot custom ROMs, do it on stock firmware only!


1) Delete all root dependant applications

2) Download this file to your SD card.
Select the right link for your phone model:
S5830 → unroot_s5830.zip
S5830i → unroot.zip
S5830C/i/M → UNROOT-S5830C-i-M.zip (xda forum)
S5830i/D → Universal_GB_UNROOT.zip (xda forum)

3) In recovery mode select "apply update from sdcard" and apply the file.
And you should get a message "Install from sdcard complete".
Select "reboot system now".

4) Your phone should be unrooted now and you can delete all
root dependent applications if you haven't done it yet.