Usb not recognized laserjet managed mfp e42540

[Simunic]

I want to upgrade firmware from usb on LaserJet Managed MFP E42540 but USB is not shown. What do I do

[Valsimot]

USB must be FAT32 formatted.  Did you confirm that the same USB is recognized when plugged in front USB?

If not working use a different USB

[Simunic]

Problem si USB is plugged in front. But I want to upgrade firmware from boot menu and there it isnt recognized and when I am in main menu it gets recognised somehow. Is this problem with USB format or something else

[Valsimot]

Did you follow these steps exactly and saved .bdl file on a USB?

Walk-up USB thumb drive: (Standard control panel menu)
After uncompressing the file you will see a xxxxxxx.bdl file.
1. Copy the xxxxxxx.bdl file to a portable USB flash memory storage device (thumb
drive).
NOTE: USB Flash Drives that are not in a Fat32 format or having a CD formatted
partition may not be recognized by the printer. You may need to try a different USB
flash drive.
2. Turn the printer ON.
3. Swipe to the left and select the Support Tools application.
4. Select the Maintenance menu
5. Select the USB Firmware Upgrade menu.
6. Insert the portable USB storage device with the xxxxxxx.bdl file on it into the USB
port on the front control panel of the product.
7. Select the xxxxxxx.bdl file you would like to use.
NOTE: If there is more than one xxxxxxx.bdl file on the storage device, make sure
that you select the correct file for this product.
8. Select the Install button on the bottom of the screen.
9. Select the Upgrade, Re-install or Downgrade option depending on the task you
are performing. The firmware upload process will begin.
When the upload is complete, the printer will reboot automatically and start the
upgrade process.
NOTE: The upgrade process may take up to 30 minutes to complete. Please do not
interrupt the updating process.
Once the printer or MFP is back online, print a Configuration Page and verify that the
new firmware has been installed.