@whitestar_999 Thanks for the link. I'll try it out. The old phone I've mentioned runs android 4.2.
Isn't there any way to open the gbk file on the computer? I'd like to save the call logs, SMSes, etc in txt format.
There is some kind of problem with the phone - two days back it started giving a message that the battery is too hot and I should remove it, and I did but it was cold to the touch. I installed a temperature app and first it showed the battery temp as -22 degrees (yes, too cold and not hot) while the cpu temps were around 40-45 degrees. After restarting the phone, the app started showing the correct battery temp, somewhere around 35 degrees. Also, the screen suddenly shows lines and stuff and locking and unlocking the phone sometimes solves the problem, sometimes doesn't. It could be a software problem so I was going to factory reset it, which is why I made the backup.
you can use android x86 image of 4.2 and the use it to save files in another format