Unlock the firmware of ST1000LX015-1U7172 more than 1 times

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Currently I am using MRT.
Seagate SSHD hybrid ST1000LX015-1U7172, 1st firmware unlock
is successfully. Lock again and SSHD back to normal.
2nd times unlock, I found the problem, led indicator at terminal
pcb keep blinking while terminal gave :

Failed to exchange commands

Flash boot code Digital Signature Verification failure
SEA5 Boot ROM 1.0 (05/05/2014)
Copyright Seagate 2014

Hdd works fine if the firmware I lock again, but in this situation,
does it means I can not do unlock the firmware of ST1000LX015-1U7172 more than 1 times?
This ST1000LX015-1U7172 is for donor SSHD, so need lock and unlock during the task.
Thank you for help.