The application of reinforcing agent will not affect the function and performance of apk itself. If the reinforced apk cannot be installed or can't start flashback, please follow the following steps for self-inspection:

1. After reinforcement, the downloaded apk needs to be re-signed, and the signatures before and after reinforcement must be consistent.

2. If the original package before reinforcement is directly exported from AndroidStudio or eclipse, please sign apk with signature tool first, then reinforce and re-sign, so as to ensure that the signature tool can be used once before and after reinforcement.

3. If the reinforcement is command-line signature, please use sha 1 signature algorithm.

4. Please confirm whether apk itself has a verification mechanism, such as signature/file md5 verification. Verification mechanism will lead to incompatibility with reinforcement.