안녕하세요

Korea wrote:

1) If you need to download the manual of NX equipment, I will contact Samsung Electronics and send you the English version file via email.

Please tell me the manual you need.

Not the user manuals, but service manuals would be helpful. In particular I have a 50-200 that is not working properly right now. As you can see from my profile, I have a lot of NX gear that I may one day need to repair myself.

https://www.dpreview.com/members/5640484641/gearlist

Actually, even there are some of the pancake lenses I didn't enter there yet.  (16mm, 20mm, NX-Mini and NX-Mini lenses, I should check and update).  This is why I requested for any service manual, they all may be useful for me.  I have taken some lenses apart myself already and put back together.  I still think I'm missing something on the 50-200 though.  AF works but MF doesn't.  It would have helped to have known the replacement part number to order before for the MF input ring circuit, though maybe now the parts may not even be available.

2) Nx 300mm lens after development
We didn't release it as a business withdrawal before launch. It is an unverified rumor that only a handful of photographers in Korea (estimated to be three) have these lenses.

However, it is highly likely that Samsung Electronics' camera researcher has it.
- Lee Hyuk-ki, Kang Byung-ho employees.

It it has become their personal property rather than company property, I'm happy to make them an offer for it.  Let me know if you ever have contact with them

3)
4)
I can't answer this.

P.S.

- Nx1 power charge is the main body - USB charge is also available and the battery can be charged to a dedicated charger.

- Battery BP-1900 dedicated to Nx1
can be easily found in Korea

-Nx Samsung Smart Camera App Guide
It also works normally on Galaxy s10 such as photo transfer, wireless release (blue-tooth shutter), and remote shooting.

/ Do not use Huawei equipment
Their security is very dangerous.

I think the Xiaomi stuff isn't very secure either.  I had an OS on my S5 that I actually trusted (LineageOS), but the stupid banking app and another app I needed to take care of local business with government (stuff like applying for stuff, paying traffic fines, etc..) claimed the device was insecure.  Their app is clearly just checking that it is rooted and doesn't understand that I rooted it, not some attacker. 
... so I needed a new phone that would work with this stuff, and I didn't realize just how pro Chinese government Xiaomi is and just how many shady stock apps would come on it.  So while I'm happy with the hardware, I'm not too pleased with Xiaomi.  On the other hand, I have no hard evidence that they're outright spying.  There was an incident with their browser sending back identifiable info, but that is inline with their terms of use for their browser actually... I don't use their apps and don't agree to any of their app TOS agreements.  So I use Firefox instead, etc...  Has Xaiomi gone as far as rootkits without consent?  Maybe, but I can't prove that and have no evidence of it so far.  On the other hand, they do act as if they're responsible about security when it comes to Western apps, so they can inform you when WhatsApp uses the camera in the background (just means you left it open in the background really)...  It comes across as a tactic to make people distrust the west more and trust the government.  And their Xaiomi Share app is political party themed, CCP of course.