Not booting up is likely fixed by formatting the drive and reloading the firmware.
1. Plug the 6270A into a PC with a USB cable. The 6270A should appear as an external drive (just like a USB thumb drive).
2. Right-click the drive letter for the 6270A in Windows File Explorer and select "Format...". Then do a "Quick Format" with default settings.
3. Then copy the firmware update files from our normal 6270A firmware update page to the drive letter for the 6270A in Windows File Explorer and follow the normal firmware update process (wait 1 minute, turn off for 1 minute, then turn back on). Details and files here,
6270A firmware update instructions
If the 6270A still does not boot properly contact Fluke Calibration Pressure Technical Support at the below link or by calling 877.355.3225.