Heltec T114 OTAFix Bootloader Update Guide

Follow this guide to back up your repeater keys and update your Heltec T114 bootloader using the Meshcore Flasher and DFU mode.

How to Back Up Repeater Keys

Before updating, back up your repeater keys using the Meshcore Flasher and the Console.

In the Console, use get prv.key to back up your private key.

In the Console, use get public.key to back up your public key.

Important: This must be done on a PC. You cannot use the app to get the keys.

Save both keys somewhere safe before continuing with the bootloader update.

Plug the device into your computer, then quickly double-press the reset button (twice within 0.5 seconds).

If DFU mode works correctly, you should see the device show up as HT-n5262 in File Explorer.

This confirms the board is in DFU mode and ready for the update.

Choose T114, then Repeater, then click Erase Flash.

Once the device erase firmware has been flashed and the flash has been erased, reboot the T114 and it should be in DFU mode.

For this example, the file is: update-heltec_t114_bootloader-0.9.2-OTAFIX2.1-BP1.2_nosd.uf2

Drag the update-heltec_t114_bootloader-0.9.2-OTAFIX2.1-BP1.2_nosd.uf2 file onto the HT-n5262 drive.

If the drive does not show, quickly double-click the restart button and drag the file over.

The device should reboot automatically once the file has finished copying.

Flash the device again, but do not use Erase Flash this time.

The bootloader update should now be complete.