HP EliteBook 840 G3 6050A2892401-MB-A01

Help I have a hp-elitebook-840-g3-6050a2892401-mb-a01 bios password.but i have no backup old bios now i flash new bios power on led on but battery led flashing no display plss me this solution
 
Laptop: HP elitebook 840 G3
motherboard: 6050A2892401-MB-A01 (UMA)

i need unlock BIOS
who can help me?
 

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