For 90% of OPPO A37m problems, is the safest.
| Method | Tool Required | Success Rate | Risk Level | |--------|--------------|--------------|-------------| | (Signed OPPO account) | OFP firmware + Auth account | High | Low | | UnlockTool / Hydra Tool (Paid) | Custom DA + USB cable | Medium | Medium | | SP Flash Tool + Auth DA (Leaked) | Need exact DA_OPPO_A37m.bin | Very Low | High | | Miracle Box (Thunder) | Specialized MTK box | Medium | Medium |