Hold the for 1 to 3 seconds, then release it while continuing to hold the key combination.
Updating the HP ProBook 4530s BIOS using a raw .bin file is possible via Insyde recovery mode or SPI programmer, but the official Windows tool is safer for non-bricked systems. Always verify hardware compatibility and back up the current BIOS before flashing. hp probook 4530s bios bin file upd
This method is advanced but is the only fix for a completely bricked ProBook 4530s. Hold the for 1 to 3 seconds, then