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EEVBlog 121GW Multimeter Firmware Details

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CDaniel:

--- Quote from: Terry01 on December 03, 2018, 01:11:42 am ---I have Keysight U1273A...does that have HY3131?

--- End quote ---

Yes , it should have HY3131 , but I think you can easily take a peek inside to confirm .

ChrisG:
I upgraded the 121GW regularly and now from 1.51 to 1.57 it's done. It stuck for 20 minutes without any progress. So I did need to switch it off (sorry). Wanting to go back to 1.51 is to no avail and it seems bricked now. What should I do? What should I check? The download option is still available though.

GeoffreyF:

--- Quote from: ChrisG on December 03, 2018, 10:51:46 am ---I upgraded the 121GW regularly and now from 1.51 to 1.57 it's done. It stuck for 20 minutes without any progress. So I did need to switch it off (sorry). Wanting to go back to 1.51 is to no avail and it seems bricked now. What should I do? What should I check? The download option is still available though.

--- End quote ---

Did you leave the back off while you did this?

ChrisG:
I tried both options. First it was on and then it was off. The batteries were still very good. However I thought I'd change them for the fun of it. No difference. Until..... I accidentally touched with the cover off with my hand the back of the SD card. I guessed it got wiggled side to side and presto.... (perhaps there is dust in?) On the other hand I've reinserted the card 10 times or more. Perhaps the gold-fingers of the slot are not that great ?
So I managed to do it in the end but this is a weakpoint in the design.

GeoffreyF:
If the cover is not in place then the batteries are not securely in place. If the battery is interrupted for even a moment while loading, that would explain your issue.   Remove the cover and check how well the batteries stay in. You will see what I mean.

I had a close call on that myself once.  Keep the cover on when installing new firmware.

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