TP-LINK TL-WR741ND V2 firmware upgrade from OpenWrt to factory

I updated the firmware once in the TP-LINK TL-WR741ND V2 router with OpenWrt | Kamikaze (r25068).
Standard root login without a password. The user has set some kind of password, so I had to hold the reset for 15 seconds while the router was turned on in order to reset the settings.

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Recovering MySQL InnoDB after power failure

Once, after the power was turned off, the UPS was discharged, then the generator automatic start did not work because it turned on and off several times, as a result, the server with MySQL was also started and disconnected from the power supply several times, later the tables of different databases were damaged , including the default database with mysql users, as a result, the MySQL daemon did not start.

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