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You can not run sim for DM800se on DM800, each box have special sim ...
And If you want change sim you should make this steps:
1-Put old sim in box
2-Flash new image for new sim
3-Turn off power
4-Change sim now
5-turn on power again
And If you want change sim you should make this steps:
1-Put old sim in box
2-Flash new image for new sim
3-Turn off power
4-Change sim now
5-turn on power again