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EEVBlog 121GW Multimeter Firmware Details

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fabrizio_fabrice:
Can  anyone who has updated to v 2.2 say how long to expect the process to remain in the "douun" mode?

Scottjd:

--- Quote from: fabrizio_fabrice on December 14, 2019, 04:03:24 am ---Can  anyone who has updated to v 2.2 say how long to expect the process to remain in the "douun" mode?

--- End quote ---
I am assuming you mean firmware version 2.02?
First make sure the new firmware file on the SD card is named “EEVBlog.bin” with no spaces in the file name or the meter might hang and just display down. If the current installed firmware is old then you might want to make sure you have a fresh set of batteries installed before running the firmware update. I think I’ve read the newer firmware will check the battery level first.

1. Turn the meter off then hold down MEM and HOLD while turning on the meter.  You will see IAP on the display.
2. Press the “SETUP” button and it will display “DOWN / DOUUN” and after 5 seconds the meter bar should start rising from the left to right.
3. Once the bar hits the end the meter will restart displaying the new version of firmware installed.
This whole process after it displays “DOWN / DOUUN” shouldn’t take more then 15 seconds.

fabrizio_fabrice:

--- Quote from: Scottjd on December 14, 2019, 05:47:44 am ---
--- Quote from: fabrizio_fabrice on December 14, 2019, 04:03:24 am ---Can  anyone who has updated to v 2.2 say how long to expect the process to remain in the "douun" mode?

--- End quote ---
I am assuming you mean firmware version 2.02?
First make sure the new firmware file on the SD card is named “EEVBlog.bin” with no spaces in the file name or the meter might hang and just display down. If the current installed firmware is old then you might want to make sure you have a fresh set of batteries installed before running the firmware update. I think I’ve read the newer firmware will check the battery level first.

1. Turn the meter off then hold down MEM and HOLD while turning on the meter.  You will see IAP on the display.
2. Press the “SETUP” button and it will display “DOWN / DOUUN” and after 5 seconds the meter bar should start rising from the left to right.
3. Once the bar hits the end the meter will restart displaying the new version of firmware installed.
This whole process after it displays “DOWN / DOUUN” shouldn’t take more then 15 seconds.

--- End quote ---
Thanks, Scottjd, yes, I followed the instructions to a Tee, but it stayed in DOUUN mode for at least 6 hours.  It started at 9 PM, but I couldn't sleep well, so up at 3 am to check.  No change, still DOUUN, except the display contrast was changing as the batteries dropped from ~ 1.54 v at the start, to 1.47.

With much trepidation I turned the meter off, then back on and it was still v. 1.57.   I repeated the process with a different microSD using the same downloaded 2.02 .bin file, but this time it worked, and it was very quick.  It immediately showed % progress and the analog bar incremented, too.   5 seconds, maybe, and it was done!  A new set of batteries, and it's ready to go!  :-+   Thanks again!

Sparky Faraday:
Are all the functions reliable now? Anything crash?
Thank you,
Sparky

Kibabalu:
Just received my 121GW with firmware version 2.04. No issues discovered so far during first day of use.

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