我有一个三星galaxy sii（gt-i9100）。 OS版本-2.3.3。每当我将它连接到kies时，它就找不到可用的软件升级。是否有其他方法可以升级我的操作系统？
I have a Samsung Galaxy SII (GT-I9100). OS version-2.3.3. Whenever I connect it to Kies, it cannot find an available software upgrade. Is there any other way to upgrade my OS?
Sure, just be aware that doing so you'll lose the warranty! If you want to do it anyway, just go to sammobile.com and look for your phone (just type i9100 in the search box). In the result list, choose your firmware and download it. To flash it, follow these steps:
Your Samsung Galaxy S2 I9100 is now successfully updated. Go to Settings > About Phone to verify the firmware version installed.
If there are any available custom recovery for your device this should work. 1st: Flash a custom recovery and download stock or custom rom that suits you (make sure they are compatible with your device) 2nd: After flashing custom recovery, go to recovery mode (custom) and factory reset and wipe system too 3rd: Go to install and find the rom and some patch files (like gapps or anything if needed) 4th: Flash the found rom and patch files (if needed) 5th: Normal boot and try the rom