回答“How to fix whole about device option”You need to rewrite NVRAM area.
回答“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.