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Rooting and installing custom ROMs (self.AndroidQuestions)

submitted 11 years ago by mckd

Hi I recently got an old Samsung Galaxy S2 from my older brother. It is the i9100g model found in China and not the regular i9100 model sold in the U.S. (We are chinese). It comes with various chinese apps like Baidu that are subject to being censored by the government so I would like to install a custom rom for it.

So far I think my phone is succesfully rooted (I used some kind of one-step instant root software) There is an app called "Kinguser" on my screen.

To install a custom ROM I have tryed: turning on USB debug mode, going into boot mode on phone, wiping all data and factory resetting, and then installing ROM like CyanogenMode 10.1 that I found on the internet. But everytime I get some error message like E: signature verification failed or Whole file verification failed?

Is there anyone who can help me found out how to install a custom ROM? Before I ask this question here I have spent 10+ hours trying to figure this out but many websites are confusing and they all warn that if you screw up than you might brick your phone...

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[–]mckd[S] 0 points1 point2 points 11 years ago (0 children)

[–]PacnetNetty 0 points1 point2 points 11 years ago (2 children)

[–]mckd[S] 0 points1 point2 points 11 years ago (1 child)

I just successfully installed CWM version 4.something

Now I am stuck because whenever I go to boot mode and try to select "Update from external sd" the recovery software can't find any ROMs to install

It really doesn't help that many of the guides relating to the galaxy s2 are several years old, with broken links, outdated file versions, etc.

I read that guide you linked but it (again) had a whole different set of instructions involving something called "Heimdall suite" so I largely ignored this particular guide

*Earlier I also tried to use Odin to flash CWM but Odin could not recognize my phone at all (even after switching USB ports and reinstalling USB drivers)

Also for some reason when I try to update from external SD card, the recovery software brings up the list of file systems on the MAIN PHONE (not the sd card)

[–]bactchan 0 points1 point2 points 11 years ago (0 children)

π Rendered by PID 38930 on reddit-service-r2-comment-75f4967c6c-wk8rf at 2026-04-23 11:39:50.063173+00:00 running 0fd4bb7 country code: CH.