This way help me recover one blade (it give 200k HW / 30 minutes after freq and vcc changes):
set default freq and vcc and reboot. after reboot wait 10-15 minutes and poweroff, plug off all connectors and place to warm temperature room for 1/2 hour (30-35 degrees Celsius), plug on all connectors, internet and powercord, and when power on, use with default settings 1-2 day. after power on the blade not be recovered right away, but soon it be self calibrated.

ps: now I have only 1008 HW for 1d20h28m1s. result so nice!