RBR50 upload speed it twice lower than download

[FedM]

I have a single RBR50 in my apartment that works in router mode
My ISP gives me 500/500. 
All devices use wifi connection on 5Hhz
When I do a wireless speedtest with macbook pro or iphone X in front of the router or 3-7 feet far, it shows 500\500 speed, sometimes 480\480, sometimes 520\520, but DL and UL speeds are the same all the time and both are near 500
But if I move to the next room or kitchen, which are behind 1 concrete wall, the UL speed appears to be almost twice lower than DL speed.
I made a few speedtests with the same devices and all of them shows around DL=280-300 UL=120-150
Any suggestions?
 
My previous routers were Amplifi HD and Google WIFI, and both of them gave me the same DL and UL speeds everywhere

[FURRYe38]

This would be one reason: "But if I move to the next room or kitchen, which are behind 1 concrete wall, the UL speed appears to be almost twice lower than DL speed"

Regardless of wifi signal, building materials like Concrete will impact wifi and performanced. Not idea of any kind of wifi. 

[FedM]

Well, it could be so, but two previous routers (Google and Ubiquite Amplifi HD) are not affected my the walls and perform the same DL and UL speeds. Both speeds dicreases the same way 500\500-----a WALL-----300/300

[FURRYe38]

Concrete matierial can effect wireless signal differently. 

Can see if any of these suggestions help:

30 feet is recommended in between RBR and RBS to begin with depending upon building materials when wirelessly connected. With Concrete, you may need to move RBS closer to the RBR. 

What channels are you using? Auto? Try setting manual channel 1, 6 or 11 on 2.4Ghz and any unused channel on 5Ghz.

Try enabling Beamforming and MIMO(MIMO may or maynot be needed) and WMM. Under Advanced Tab/Advanced Settings/Wireless Settings

Try disabling the following and see:
Armor, Circle, Daisy Chain, Fast Roaming, IPv6 and Set 20/40Mhz Coexistence to 40Mhz only. Save settings and reboot the router and satellite(s).

[FedM]

ok

I havу just tested the speed in the same room where the router located, so no walls, but about 10 feet from the router

The results are 480\400. Repeated three times, almost the same always

Noticed your full reply too late sorry

[FURRYe38]

And thats good results then. 

[FedM]

So is it ok that the upload speed is lower?

[FURRYe38]

Yes. Will vary at times depending on conditions and testing server your connected too as well. Many factors in wireless speed testing which can give inaccurate or varied results. 

Wired speed testing is preferred to ensure speeds are what your paying for. 

[FedM]

I have no setellites, just a single RBR

2.4hhz channel is set to Auto (Ive seen just my iphone only once switched to 2.4, all other devices work on 5hhz all the time)

5hhz channel is set to 48, the unused one. Ive tried every posibble chanel and the issue is still exist 

Beamforming, MIMO and WMM enabled

Where can I find the last settings you mentioned?

[FURRYe38]

Well there is another consideration as well. Having a single wifi source with concrete around, the single source can only do so much. You might want to consider adding a RBS to help with this building configuration. 

Under Advanced Tab/Advanced Settings/Wireless Settings

[FedM]

Addind a satellite will make the signal stronger but will not increase speed I think

I cant see Armor, Circle, Daisy Chain, Fast Roaming, IPv6 and Set 20/40Mhz Coexistence to 40Mhz only in Advanced\Advanced setup\wireless settings

Here is what I have 

plus MIMO and Beamforming lower

http://imglink.ru/pictures/09-10-19/dce2dc33e0b5f57432167787d941b30b.jpg 

[FURRYe38]

You might find Armor and Circle under Security. If that is if you enabled them upon initial setup. 

Fast Roaming maybe towards the bottom of the advanced wireless settings page. 

IPv6 will be under Advanced Settings. 

Uncheck the check box next to 20/40Mhz Coexistence. This will set 40Mhz only. 

[FedM]

No such boxes in security, I dont remember I enabled it either

Cant see fast roaming at the bottom or advanced wireless settings

Here is the screen pic

http://imglink.ru/pictures/09-10-19/0f75ba7680dfcba2e416835659cd8e29.jpg 

Changed to 40mhz

[FURRYe38]

I see your using old FW. v1x Probably why it's not seen there. 

[FedM]

What does it mean an old FW?

After setting to 40mhz and rebooting here is what I have. 

20 feet far and one concrete wall

http://imglink.ru/pictures/09-10-19/6f398dda7a6b208428bc95e7e249189b.jpg 

[FedM]

Firmware lol

sorry for dumn question

Should I install the latest FW?

[FedM]

Now I have an issue with updating FW

I tried to apdate it with 2.2.1.212 first as Netgear says

This is what I got 

http://imglink.ru/pictures/09-10-19/0ed01da307c44c8c13d5f1d187b493dd.jpg 

Then I tried to update with 2.3.5.30

and I got the same 

So I even cant update the FW

[FedM]

Finally I updated the FW to the latest

And did all the things you suggested

Still the same result

http://imglink.ru/pictures/09-10-19/4d2de60345904dacc7bb3bbcb5ac4a01.jpg