I thought M1 was Korean made and M2 and M3 Chinese?
I was really hoping this receiver to be similar to the F15 (and it is) but there are certain things missing like no dB readout or signal quality information when below lock - so difficult to find weak satellites.
Yes the M1 is South Korean made & the M2 Chinese & they are the same build quality & hardware both very good receivers except for the 45,000 symbol rate that pops up when a low symbol; rate is in use,
never fixed still an excellent receiver though,
It's the M3 where the Chinese changed the design of the software/hardware it is not actually a TM5402HD but a TM-F3/5 Mk2 with transponder data base errors even if you delete them they come back Turksat 42 east ends up with East & West transponders even if you cannot receive them in your location
same goes for some of the other satellites
another fault never fixed,
But the M3 suits 95% of customer needs most people think it is a brilliant receiver for DTH satellites 28E 19E 13E ect
This is why the TM5402M1 & M2 are sought out by enthusiasts
for fringe reception & a more stable data base but as we only account for 5% of the sales we have to make do with what is on offer,
I prefer the excellent TM6900HD Combo & TM6902HD combo from these TM NDF series of receivers
they are more expensive but they are worth it.