*SUCCESS*
Man, I like this UT210E so much more now with these mods. It defaults to DC(v)(a), 6000 count, 3min backlight, 30min Power-off, full 6000 count 2A Dotless mode and NCV extra readings, WoW
Got up this morning with fresh mind and a set of rested eyes and had another go at it. First I tried grounding the XTAL as stj suggested but it did not help.
I was going to lift WP pin or cut traces but decided to first try grounding the processors RESET pin like seen in this video
https://youtu.be/el3rW7O27IQHowever, I could not find the RST pad on my UT210E
Opened up the DTM0660 datasheet and found the RST is on pin 55. Looking at PCB I found a Cap I could easily attach the ground to to set RST low.
Here is how I did it with Arduino UNO. I've attached the sketch I used based on Kerry's D source with additions.
I just wired it up as shown in the diagram.
I held a grounded jumper wire on the side of the capacitor shown in diagram. No need to solder to it. It only takes 3 seconds to dump/flash.
Switch UT210E to ~V mode then plug in Arduino into the USB. Open the attached i2cArduino210E.ino sketch in Arduino IDE. Open Serial Monitor window (CTRL+SHIFT+M). Now upload the sketch. You should see your eeprom dump in Serial Monitor window. You better Copy/Paste it for backup.
Now you must edit line 9 and 10 by using data from your dump.
//Dotless mode calibration data, copied from 0x50, 0x51
writeByte(I2C_ADDR, 0x56, (byte) 0x83);
writeByte(I2C_ADDR, 0x57, (byte) 0x75);
If all good, you can edit MODeeprom() as you like, uncomment the //MODeeprom() inside setup() function and Re-Upload to Arduino. Arduino will reset and flash the eeprom. You will see ...Flashing EEPROM... between Before/After dumps in the Serial Monitor window. I hope others will find this useful.
Thank you everyone!
The changes I've done to my eeprom so far:
ADDR | OLD | NEW6200 Count12: 98 38
13: 08 18
All Alarms disabled16: 3D FF
17: 3D FF
18: 3C FF
19: 3C FF
1C: 0A FF
2A Dotless mode calibration data device specific, copy yours from 0x50 to 0x56, 0x51 to 0x57. Required if you enable Dotless 2A mode. 56: 00 ??
57: 80 ??
2A modes: 1. Dotless DCA, 2. Dotless ACA, 3. Dot DCA, 4. Dot ACA87: 17 1C
97: 16 1D
A7: 00 16
B7: 00 17
20A modes: 1 Dot DCA, 2. Dot ACA8B: 19 18
9B: 18 19
100A modes: 1 Dot DCA, 2. Dot ACA8D: 1B 1A
9D: 1A 1B
V modes: 1. DCV, 2. ACV, 3. DCmV, 4. ACmV8E: 04 03
9E: 05 04
AE: 00 05
BE: 00 06
NCV, NCV mV9C: 00 02
AC: 00 1D
30 min Auto power off FB: 0F 1E
3 min Backlight off FC: 0F B4
credits: People in this thread and on Russian and Chinese forums.