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Older methods were finicky. You had to pray that your USB 2.0 port wouldn't timeout. The optimized bypass algorithms are now much faster. They reduce the time window between the BROM exploit execution and the payload delivery, making the success rate near 100% even on lower-quality USB cables. mt6789 auth bypass better
auth_sv5.auth file (or equivalent), the preloader will reject any read/write command. You get the dreaded STATUS_BROM_CMD_STARTCMD_FAIL or S_BROM_DOWNLOAD_DA_FAIL.