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I upgrade the new firmware to my printer ,

 

the firmware version is HP_LaserJet_Pro_M28_M31_Firmware_Update_20210121

 

download link  https://support.hp.com/cn-zh/drivers/selfservice/hp-laserjet-pro-mfp-m28-m31-printer-series/16647082...

 

The HP LaserJet Pro MFP M30w MFP printer is defined as "hp rbx boot".

 

How can recovery my printer

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