Response:
Hello hoangthanh954.
As you mentioned, from the night of June 23, 2015, the TaiG Jailbreak Team introduced TaiG 2.0 to Jailbreak iOS 8.3, and on Mytour, we also provided a detailed guide on Jailbreaking iOS 8.3. Regarding whether you should Jailbreak iOS 8.3 immediately for your iPhone 5 64GB, we advise as follows: Currently, some users encounter errors during the Jailbreaking process, some are unable to install additional apps from Cydia, and there are various other minor issues... Due to these arising problems, we recommend that you refrain from Jailbreaking iOS 8.3 hastily.
https://Mytour.vn/co-nen-jailbreak-ios-83-ngay-hom-nay-khong-2544n.aspx
In addition, Mytour readers can also share their iOS Jailbreak experiences to help you, hoangthanh954, gain more insights into using the iPhone.