Cameras & sensors / Unofficial firmware
Reconstructs the meter application and bootloader as editable C, then tests it on the meter including Bluetooth.
Read the original build See shopping list
A rebuilt meter application runs on the real multimeter, including Bluetooth.
Article describes the overnight Claude Code job, emulator comparison, Ghidra/GCC workflow and Dave Jones testing the meter.
An enabling experiment, not a new everyday feature. Do not rely on modified firmware for safety-critical measurements.
Reported build walkthrough
Hardware used · Product page
A rebuilt meter application runs on the real multimeter, including Bluetooth.
View EEVblog 121GW
This link is for EEVblog 121GW only. See the full parts list below before ordering.
Exact model · Directory
The project names EEVblog 121GW. Check its full shopping list for accessories and revision requirements.
Experimental open firmware is not a calibration or safety certification. Keep all test leads disconnected while servicing; do not use modified firmware for hazardous-voltage measurements.
Quantities are for one build. Unless marked source-specified, they are planning quantities; confirm kit contents and the chosen configuration before ordering.
Exact meter target.
Creator source. Planning quantity for one build; check the selected configuration.
Exact product
Firmware, operating system or project storage.
The README documents the SD bootloader update path; match supported card formatting.
Creator source. Planning quantity for one build; check the selected configuration.
No exact purchase link verified; confirm the model and requirements above before ordering.
Write the update file.
Setup requirement — check against your configuration. Planning quantity for one build; check the selected configuration.
Use existing equipment or match the specification above. No exact purchase link verified.
Build, configure or flash the software.
Setup requirement — check against your configuration. Planning quantity for one build; check the selected configuration.
Use existing equipment or match the specification above. No exact purchase link verified.
Power the meter.
Manufacturer lists four AA cells; use fresh batteries for updating.
No exact purchase link verified; confirm the model and requirements above before ordering.
Alternative development/recovery route.
Not required for the normal SD update path. Requires opening and correctly connecting the meter.
Creator source. Planning quantity for one build; check the selected configuration.
No exact purchase link verified; confirm the model and requirements above before ordering.
Source reviewed, not assembled or hands-on tested. A working product page does not confirm stock, firmware compatibility or a complete build.
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