last update.
i have updated my scope to newest FW 1.3.26 version. and every think it is ok. i would to thank everybody who was generous and patient advising and helping me especially tv84 who did the important work for reconfiguration the scope.
thank you guys i really appreciate your efforts. and i'm pleased to help any body who might would face the same situation
One note.
Still (afaik) it is not same as SDS1202X-E
You can check it easy.
Generate example 40000 pulse single burst. Set Burst frequency to 400kHz (pulse period 2.5us) and pulse width (example) 200ns.
Set oscilloscope: 1 channel on. 50ns/div. Trig rising edge. Mode Sequence and set trig so that it capture only single sequence. Set segments in sequence exactly 40000.
Start single sequence.
After then start pulse generator so that it generate this 40000 pulses burst only.
After it have done, look if oscilloscope have captured every pulse. You can after this see this pulse on screen and also you can see in history there is exactly 40000 pulses.
If not, it is not SDS1202X-E and not ewven SDS1102X-E. It is still SDS1x02X-C but with languages.
But if there is in history now 40000 segments then it is as SDS1202X-E (SDS1202X-E can do even bit faster in real.. bit over 490000 segment/s with this said setup)
Also normal view (not sequence) wfm speed is afaik less than with SDS1202X-E hardware.
If Oscilloscope single Sequence never come ready with this settings... you can just interrupt is and go to History and look how many segments it have get... and in data table you see how fast it have been... look time stamps.
Siglent have also told C models are half speed (propably less brute force inside).
Naturally this is not meaningful at all for many users.
Also there is other methods to check is it SDS1202X-E or still X-C but this is simple and "bullet proof".
HW is not changed!
Also Siglent warranty is valid only in China and as defined there so if meet any problems...
These are "web shop only" models. As example here
https://item.jd.com/10022992281441.html#crumb-wrap1614 CNY.
Naturally this is not meaningful at all for many users.