Answer to "How to fix whole about device option"You need to rewrite NVRAM area.
Answer to "Crash and bootloop after some time"Probably you use some application that is incompatible or catch conflict. The OT-6030 ( and double SIM variant OT-6030D ) is well maded ( for price level ) with simple construction phone. Most defects comes from LCD cracking or somethin like. Just one i was catch eMMC fault. Phone can be easy serviced via online One Touch Upgrade S or offline via SP-FlashTool. Don't worry - it's nice phone for about the money.