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[Q] No 5ghz 802.11n after Jelly Bean update?

more information found... see additional notes later in this thread.
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Hi folks,
Just updated my P6210 to Jelly Bean (KIES_HOME_P6210XXMD3_P6210OXAMD3) and now it won't see any 5ghz wifi. Connects just fine to 2.4ghz. ICS had no problems seeing that there were 5ghz networks and connecting to them.
I've done a lot of searching and it looks like this issue has come up on other devices as well. People have recommended everything from doing a factory reset and suggesting it will start working again. I've also seen folks say this happens if you don't clear cache and factory reset before updating the firmware. Nothing has worked for me.
I've gone back and reloaded ICS and 5ghz immediately works again just fine, so the issue is obviously something to do with the Jelly Bean update or somewhere in how the update is loaded. I've just cleared cache/factory reset/updated to jelly bean again, and the 5ghz networks are gone again.
Apologies if a clear explanation is out there already; I haven't been able to find it.
Is anybody able to help me understand exactly what is going on and if it is possible to get the 5ghz wifi working under Jelly Bean on the P6210 without rooting the device?
Thanks very much for any help,
rjb

rjbeep said:
Hi folks,
Just updated my P6210 to Jelly Bean (KIES_HOME_P6210XXMD3_P6210OXAMD3) and now it won't see any 5ghz wifi. Connects just fine to 2.4ghz. ICS had no problems seeing that there were 5ghz networks and connecting to them.
I've done a lot of searching and it looks like this issue has come up on other devices as well. People have recommended everything from doing a factory reset and suggesting it will start working again. I've also seen folks say this happens if you don't clear cache and factory reset before updating the firmware. Nothing has worked for me.
I've gone back and reloaded ICS and 5ghz immediately works again just fine, so the issue is obviously something to do with the Jelly Bean update or somewhere in how the update is loaded. I've just cleared cache/factory reset/updated to jelly bean again, and the 5ghz networks are gone again.
Apologies if a clear explanation is out there already; I haven't been able to find it.
Is anybody able to help me understand exactly what is going on and if it is possible to get the 5ghz wifi working under Jelly Bean on the P6210 without rooting the device?
Thanks very much for any help,
rjb
Click to expand...
Click to collapse
What country are you in? The current update is a UK ROM, if you are in the US, it may not see all the wifi channels properly.

DigitalMD said:
What country are you in? The current update is a UK ROM, if you are in the US, it may not see all the wifi channels properly.
Click to expand...
Click to collapse
I am in the US and the device has been configured for US for language, etc... Wouldn't they all need to have visibility to all frequencies for when folks travel with their devices or is it generally accepted that WiFi may not work as expected when you travel abroad? I don't travel much so I have no experience with that.
Thanks very much for the response. I really have no idea if that might impact WiFi access.
When I initially updated from Honey Comb to ICS, it was a European firmware that was available first. I had no problems reaching 5ghz wifi with that firmware. I did eventually update again when the US firmware came out, however it was just because it was available and not to address any deficiencies.
So far... here's what I've used:
Honey Comb - Factory Installed - 5ghz & 2.4ghz worked
ICS - United Kingdom / Ireland - P6210XXLPN/P6210OXALPN - 5ghz & 2.4ghz worked
ICS - Cellular south - P6210UELPC/P6210XARLPC - 5ghz & 2.4ghz worked
Jelly Bean - United Kingdom / Ireland - P6210XXMD3/P6210OXAMD3 - 2.4ghz works but no 5ghz
ICS - Cellular south - P6210UELPC/P6210XARLPC - 5ghz & 2.4ghz worked again (downgraded)
Jelly Bean - United Kingdom / Ireland - P6210XXMD3/P6210OXAMD3 - 2.4ghz works but no 5ghz (even after clear cache/factory reset, etc.)
again... appreciate the thoughts.
rjb

more info: "WiFi 5ghz Auto (DFS) channel setting not compatible after upgrade to JB?
Update:
I poked around more and found
"Issue 37482:Galaxy Tablet ICS 4.0.4 Update Disables 5GHz Wifi"
(https://code.google.com/p/android/issues/detail?id=37482)
regarding the same issue but with ICS 4.0.4 on a what is only identified as a "Samsung Galaxy tablet"
There was a response noting a similar experience and suggesting that the OP change their 5ghz channel setting on their router from auto to 36 as this resolved the issue for the responding poster.
Well... it also worked for me.
So the issue now is redefined to:
"WiFi 5ghz Auto (DFS) channel setting not compatible after upgrade to Jelly Bean???"
The issue poster had this happen when they updated to 4.0.4 (albeit we have no idea what device they were using) while 4.0.4 worked fine for me. I run into the same issue when I update to 4.1.2.
Anybody have any idea what is going on here? Does anybody have one of these working with 5gh Auto (DFS)? Any guesses what would change between the 4.0.4 firmware and the 4.1.2 firmware for this device that would require a change to the wifi settings on the router?
Samsung Model GT-P6210MA w/ Jelly Bean 4.1.2
Cisco (Linksys) WRT610N w/ firmware 2.00.01
Router Config #1
5ghz Wireless Settings that don't work (P6210 doesn't even see the 5ghz network when scanning)
Network Mode: Mixed
Channel Width: Auto(20MHz or 40MHz)
Wide Channel: Auto (DFS)
Standard Channel: Auto (DFS)
SSID Broadcast: Enabled
Router Config #2
5ghz Wireless Settings that do work (P6210 sees the 5ghz network and connects just fine)
Network Mode: Mixed
Channel Width: 40MHz only (can't be auto if you want to select the wide channel)
Wide Channel: 38 (maybe others would work, too... haven't tested.)
Standard Channel: 36-5.180GHz (can't be left at auto once other parameters are changed)
SSID Broadcast: Enabled
I'd be interested in any explanation why this is happening. Thanks very much for any help.
rjb

DigitalMD said:
What country are you in? The current update is a UK ROM, if you are in the US, it may not see all the wifi channels properly.
Click to expand...
Click to collapse
It's not a router , or even software issue, its probably a parameter in the Android system/build.prop file that is hardcoded to GB or UK, since this is a UK release.. This would tell the drivers to use UK wifi channels instead of your chosen local. and NO the channels are not the same in the US as in GB/UK, some are the same and some are not the UK has several channels that are not used by US routers , not permitted by the FCC and vice versa..., That's why forcing your router to channel 36 or 1 might work while auto might not work or randomly might work depending on what channel your router finds is clear..
Remember these first single country releases by Samsung are done as really a test or beta. It helps find problems which will be fixed in the broader releases.

DigitalMD said:
It's not a router , or even software issue, its probably a parameter in the Android system/build.prop file that is hardcoded to GB or UK, since this is a UK release.. This would tell the drivers to use UK wifi channels instead of your chosen local. and NO the channels are not the same in the US as in GB, some are the same and some are not the UK has several channels that are not used by US routers , not permitted by the FCC and vice versa..., That's why forcing your router to channel 36 or 1 might work while auto might not work or randomly might work depending on what channel your router finds is clear..
Remember these first single country releases by Samsung are done as really a test or beta. It helps find problems which will be fixed in the broader releases.
Click to expand...
Click to collapse
gotcha...
Thanks for helping me understand what's going on here. Appreciate the help.

rjbeep said:
gotcha...
Thanks for helping me understand what's going on here. Appreciate the help.
Click to expand...
Click to collapse
No problem, If i were near a 5ghz router right now, I'd check it out and find the problem, but Im not.

I haven't experienced a problem yet running JB on the 6210 connected to the 5 GHz AP on my router.
Linksys E3000 running Tomato USB FW (Tomato Firmware v1.28.9054 MIPSR2-beta E3000 USB Ex)
2.4 GHz AP:
MAC Address 98:FC:11:7C:69:27
Wireless Mode Access Point
Wireless Network Mode Auto
Radio Enabled
SSID bwifinet
Security WPA2 Personal (PSK) + AES
Channel 11 - 2.462 GHz
Channel Width 20 MHz
Interference Level Acceptable
Rate 72 Mbps
5 GHz AP:
MAC Address 98:FC:11:7C:69:28
Wireless Mode Access Point
Wireless Network Mode N Only
Radio Enabled
SSID bwifinet5G
Security WPA2 Personal (PSK) + AES
Channel 64 - 5.320 GHz
Channel Width 40 MHz
Interference Level Acceptable
Rate 108 Mbps
You could try installing and playing around with the Wifi Analyzer app on your tablet to see what channels are best, available, etc.

[/COLOR]
k_t_b said:
I haven't experienced a problem yet running JB on the 6210 connected to the 5 GHz AP on my router.
You could try installing and playing around with the Wifi Analyzer app on your tablet to see what channels are best, available, etc.
Click to expand...
Click to collapse
Like I said, if its a hard coded parameter in one of the build files, like build.prop... it will tell the drivers to use a UK configuration in which case they will not even see some US channels. It won't matter what you set your locale in settings to... For example US uses 802.11G channels 1-11 only whereas other parts of the world use additional channels up to 14. Same applies to 5ghz, so it could randomly work or not work depending on what channel your Wifi router happened to working on. And if you Wifi AP is doing auto channels, it could work today and not tomorrow.
See here for additional info
http://en.wikipedia.org/wiki/List_of_WLAN_channels 2.4ghz
http://www.digikey.com/us/en/techzo...erence-between-24-ghz-5-ghz-wireless-lan.html
5 ghz

[Q] No 5ghz wireless detection with Lollipop

Hi all,
Strange problem following my OTA lollipop update yesterday. My (UK WIFI version) Shield tablet is unable to detect my router's 5ghz signal. Kit Kat had no problems and all my other devices can still see it fine. I have also tried changing the settings on my router to see if Lollipop is more fussy about frequency/band etc, but still no joy
Anyone else having strangeness with this? Or is it just me?

ClownShoes said:
Hi all,
Strange problem following my OTA lollipop update yesterday. My (UK WIFI version) Shield tablet is unable to detect my router's 5ghz signal. Kit Kat had no problems and all my other devices can still see it fine. I have also tried changing the settings on my router to see if Lollipop is more fussy about frequency/band etc, but still no joy
Anyone else having strangeness with this? Or is it just me?
Click to expand...
Click to collapse
I flashed the US ROM last night, and during setup it took maybe an additional 20 seconds before the 5ghz routers (including mine) to show up in the list. 5ghz has always been kinda weird for me though. On a few occasions I've had to disable WiFi, wait 10 seconds, then restart so that the tablet will connect.

I also have the UK wifi version, and my tablet even connected first to the 5ghz network, I was actually surprised.

No issues here with 5ghz wireless.

pyro9219 said:
I flashed the US ROM last night, and during setup it took maybe an additional 20 seconds before the 5ghz routers (including mine) to show up in the list. 5ghz has always been kinda weird for me though. On a few occasions I've had to disable WiFi, wait 10 seconds, then restart so that the tablet will connect.
Click to expand...
Click to collapse
flakz0r said:
I also have the UK wifi version, and my tablet even connected first to the 5ghz network, I was actually surprised.
Click to expand...
Click to collapse
Thanks guys,
It's very odd, because I run wifi analyzer at home and it doesn't show my 5ghz network at all, yet in the office it does show the 5ghz one.
It was working before the update and all my other devices can still connect fine, so a real mystery

NZtechfreak said:
No issues here with 5ghz wireless.
Click to expand...
Click to collapse
Thanks. Does sound like just me then

Reboot the router?

I'm having this issue with my Nexus 4: http://forum.xda-developers.com/nexus-4/help/lollipop-5ghz-wifi-t2945330

Upon further inspection, it appears the only 5ghz channels that work are the first couple in band A (36 - 48) Nothing else seems to work.
Can anyone else confirm this behaviour? Try using a 5ghz channel other than 36 - 48
Band A : 5150 - 5350 MHz (channels 36 - 64)
Band B: 5470 - 5725 MHz (channels 100 - 140)
This is pretty rubbish if this is the case, as the band B channels allow a higher output and give me a much stronger signal in my house

ClownShoes said:
Upon further inspection, it appears the only 5ghz channels that work are the first couple in band A (36 - 44) Nothing else seems to work.
Can anyone else confirm this behaviour? Try using a 5ghz channel other than 36 - 44
Band A : 5150 - 5350 MHz (channels 36 - 64)
Band B: 5470 - 5725 MHz (channels 100 - 140)
This is pretty rubbish if this is the case, as the band B channels allow a higher output and give me a much stronger signal in my house
Click to expand...
Click to collapse
I can only connect when I use channels 36-48, Band A UNII 1. Can't even detect the AP with WiFi Analyzer on the shield if I go above 48.
Using the non-US 32GB LTE version in the EU, btw, same frequencies are allowed here as in the US.

debunk said:
I can only connect when I use channels 36-48, Band A UNII 1. Can't even detect the AP with WiFi Analyzer on the shield if I go above 48.
Using the non-US 32GB LTE version in the EU, btw, same frequencies are allowed here as in the US.
Click to expand...
Click to collapse
Sorry, you're right 48 does also work.
So that's confirmed then, they have for some reason heavily limited the 5ghz channel selection! I wonder why?
It's not a hardware limitation as it was working fine with KitKat, so I wonder whether it's possible to get the other channels unlocked?

Just to be sure, ClownShoes, does channel 140 work for you? I can't test this because my fritzbox router doesn't have an option to change channel width to 20MHz, and channel 140 isn't available to me for this reason.

Same problem for me here. No 5ghz detected when my Xperia Z1 Compact detect it . Even Wifi Analyzer can't see it . I restarted my tablet & stuff, nothin' . I'll try to make a nandroid backup, make a fresh install and I will see the result.

Same problem for me here with my samsung galaxy note 3 32 gb(sm-n9005). If I restart router phone view and connect to 5 GHz. When phone leave coverage are for same hours when come back don't see 5 Ghz wireless. This is strange because I have another phone with windows which work perfect. I will try to change wireless channel if don't work, I thing serious to go back at android 4.4.2
Update: I changed channel from auto to 48 and works.

Just dropping in to say I had the same issue: I had my router on channel 112 and the Tablet wasn't even seeing it.
Switched to 48 and everything works fine now.

Same issue here, hoping Android 5.1 fixes this silly issue. I was wondering why i couldnt see the 5Ghz network at channel 140, 80mhz. had to bring it down to channel 48.

US wifi version here. 5.1 Lollipop, stock rooted.
I can connect to channel 149 with turbo mode (40MHz channel width) & the upper Extension channel, but WiFi analyzer shows my router is broadcasting on channel 153. I tried so many other channels & combinations but this is as high up as I could go & have the tablet connect. It did, however, see channel 161 but got an authentication error & wouldn't connect with the router.
So, back to 149. The signal is slightly stronger & have better throughput than channel 48!
On a side note...I use 5GHz here in this LARGE apartment complex because everyone here is on Verizon FIOS or Cox Communications, so Wi-Fi Analyzer sees 17 (give or take a few for signal strength or weakness) access points around my place & the 2.4 band is completely choked up! There is only 1 other router close by on 5GHz, so using that band is the only option for wireless internet here. I don't use Verizon's wireless AP. They only have 2.4 wireless, no 5. My Netgear simultaneous dual band router is plugged into the back of their cable modem & my Netgear is on 192.168.2.1. That way I can use DD-WRT & my own router instead of theirs for wireless. Easy-Peasy!:good:

I have the same issue. After switching my channel from 100 to 40 the 5GHZ wifi showed up on (two) shield tablets just fine

I believe the SHIELD Tablet only supports United States Non-DFS channels, so 36-48 and 149-165. I personally have mine on Channel 149 and 80MHz bandwidth.

S6 cant see my 5 GHZ wireless network . Really could use some help

Hello,
So I'm facing this weird problem, my s6 cant see the 5 GHZ network. But can see and connect to the 2.4 GHZ network. I've used the 5 GHZ network with a xperia z. I've flashed stock firmware via odin and also tried custom roms. Same problem. Any solution ?

SaffatBokul said:
Hello,
So I'm facing this weird problem, my s6 cant see the 5 GHZ network. But can see and connect to the 2.4 GHZ network. I've used the 5 GHZ network with a xperia z. I've flashed stock firmware via odin and also tried custom roms. Same problem. Any solution ?
Click to expand...
Click to collapse
Check your router for 5GHz channel settings if its on auto select try setting a channel manually the router could be using a channel the S6 can't see.
I have had to do this in the uk with my Asus RT-AC87U i had to set it to channel 36 but it will see some other higher channels.

CapricornDog said:
Check your router for 5GHz channel settings if its on auto select try setting a channel manually the router could be using a channel the S6 can't see.
I have had to do this in the uk with my Asus RT-AC87U i had to set it to channel 36 but it will see some other higher channels.
Click to expand...
Click to collapse
Tried with different channels but still no solution. After doing a factory reset, Mobile can see the 5 GHZ but cant connect to it. Cant connect via password, wps pin wntry or wps push button. Also after the initial phone setup is complete, the mobile never sees the 5 GHZ again

Wi-fi dropping?

I have an ASUS wireless router, and my wi-fi connection at home is dropping all the time (especially while playing Hearthstone, frustratingly). Is anyone else experiencing this and/or know how to fix it?

My experience has been that the wifi on my phone works great, leading me to wonder about either your router or your environment.
questions and things to try
1. Does you phone work well with other access points? i.e. is the problem only at home but it works elsewhere?
2. is your home a "noisy" wifi environment? i.e. lots of other nearby access points or other devices in the 2.4 Ghz band?
a. Get an app from the play store called Wifi analyzer (its free). You can see a chart with all the access points your phone can see and what chanel they are using. It can show both the 2.4 and 5 Ghz bands.
b. If your router is showing up on the same channel or a nearby channel as one or more other access points, try manually setting the channel on your router to something else that no one else is using or near.
c. If you router is dual band (i.e. has both 2.4 and 5 ghz) and you are using 2.4 Ghz, try using 5 Ghz. You can set your 2.4 and 5.0 Ghz to different SSID's (network names) so that you can easily tell which one you are connected to.
3. Do other wireless devices you have also have connectivity problems? Consider a new router?

I had problems with wifi dropping. I went to Comcast and swapped out my modem for a new modem/router and haven't had the problem since
Sent from my SM-N920V using Tapatalk

I've had very poor speeds on WiFi compared to my nexus 6p. Annoying it's so slow

skinote said:
I have an ASUS wireless router, and my wi-fi connection at home is dropping all the time (especially while playing Hearthstone, frustratingly). Is anyone else experiencing this and/or know how to fix it?
Click to expand...
Click to collapse
I suspect the issue has to do with my Asus router. Apparently Samsung devices and Asus routers don't play well, according to what I've read, but I have no idea how to fix it.

Force wifi to connect to only 5ghz

i am using a router which broadcast both 2.4ghz and 5ghz band using single SSID. how do i force my phone to only allow to connect to the 5Ghz wifi network. i cannot turn off the 2.4ghz band as there are other devices in my house that only support 2.4ghz or do i want to split the bands into 2 SSID.
Thank you.

i was able to split my router to 2 different SSID for both bands

In the past there used to be an option in advanced wifi settings that made the 5GHz "preferred" but Google took it out for some reason.
The disabling of the 2.4 GHz or having 2 separate SSIDs might be the only way right now (not sure for a rooted phone tho)
Sent from nowhere over the air...

Yes not sure why did Google remove that option. Any hidden secret code i.e. *#00*# etc that allowed us to make changes to network setting.

Some routers have band steering which will force devices to 5ghz if supported while keeping 2.4ghz for devices that can't.
Sent from my SM-N986U using Tapatalk

I turned off Auto Connect on my 2.4ghz, so it stays on 5ghz all the time.

Eagle 3 said:
I turned off Auto Connect on my 2.4ghz, so it stays on 5ghz all the time.
Click to expand...
Click to collapse
Mine only 1 ssid for both band. Seem like there is no solution and i had to split the bands into 2 ssid.

angka8 said:
Mine only 1 ssid for both band. Seem like there is no solution and i had to split the bands into 2 ssid.
Click to expand...
Click to collapse
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.

Eagle 3 said:
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.
Click to expand...
Click to collapse
thanks, but for me both the bands are broadcast into one SSID. which means i can only find one wifi connection and the wireless router will change the band connection based on the signal strength when i am moving around the house. it will change the connection to 2.4ghz when i am in some place where the 5ghz connection is weak. why i wanted to stay with 5ghz when the connection is weak because it give a much higher download/upload speed compare to the 2.4ghz connection which somehow got much weaker internet speed to the extent of unusable.

angka8 said:
thanks, but for me both the bands are broadcast into one SSID. which means i can only find one wifi connection and the wireless router will change the band connection based on the signal strength when i am moving around the house. it will change the connection to 2.4ghz when i am in some place where the 5ghz connection is weak. why i wanted to stay with 5ghz when the connection is weak because it give a much higher download/upload speed compare to the 2.4ghz connection which somehow got much weaker internet speed to the extent of unusable.
Click to expand...
Click to collapse
Buy a new router where you can separate them and then disable or turn off the 5ghz connection

Looks like this is quite an issue for N2Us. I have a 4 year old iphone and it stays connected to 5GHz in the same place and N2U reverts to 2.4. I have band steering and have been really well on all other devices. Issue lies only with N2U.

Snowleopard1900 said:
Buy a new router where you can separate them and then disable or turn off the 5ghz connection
Click to expand...
Click to collapse
Mine can separate them but since it is only affecting my phone, I hope the change can be on the phone instead. By separating them, I will need to configure all those devices that can only connect to 2.4ghz. e.g. ring peephole

Did you solve issue? Same problem here :/

Eagle 3 said:
I only have 1 ssid. Like I said, I turned off Auto Connect for 2.4ghz so it always stays on 5ghz.
Click to expand...
Click to collapse
Errr...you actually DON'T have one SSID but 2. The band is appended on the name and they are actually 2 different WiFi networks with different names so you could turn off auto-connect on the 2.4GHz one

I use the Wireless Mac Filter on my router to block 2.4Ghz Band for my phone mac address, so the phone can only connect to 5Ghz

If you are using a Samsung phone in the advanced settings for wifi, turn off use randomised MAC address and use the phones actual MAC. This fix has been tested on Netgear routers and works, phone will join the faster 5ghz and still be able to switch to 2.4 if you are at a distance from the router

SenatorDC said:
If you are using a Samsung phone in the advanced settings for wifi, turn off use randomised MAC address and use the phones actual MAC. This fix has been tested on Netgear routers and works, phone will join the faster 5ghz and still be able to switch to 2.4 if you are at a distance from the router
Click to expand...
Click to collapse
Thanks, this worked with Pixel 4a on ruckus WiFi as well!

angka8 said:
i am using a router which broadcast both 2.4ghz and 5ghz band using single SSID. how do i force my phone to only allow to connect to the 5Ghz wifi network. i cannot turn off the 2.4ghz band as there are other devices in my house that only support 2.4ghz or do i want to split the bands into 2 SSID.
Thank you.
Click to expand...
Click to collapse
This is what i did .
(It might give you an very easy option /idea .)
My current setup is a Nokia fibre router that has 2.4 ghz and 5 ghz bands
I bought a reasonable priced wifi mesh 'TP DECO M4 "then
connected it to my fibre router ( ethernet cable )
The TP wifi mesh comes with an Android app fo configure it (settings )
All i did was swicth off the 2.4 ghz band in app, for my TP decom 4 model .
So if i wand to use only 5ghz i connect to my TP DecoM4 ( which is connected to my Nokia fibre router)
My othe devices( that only use 2.4 ghz bands ) i connect dirrectly to my Nokia fibre router, that has 2.4ghz band active ...and also the 5ghz ,
So fo me its a matter of to switch 2.4 ghz on and off in the Android TPlink app .
Hope this give you an very straightforward option ?
good luck
see screenshots below

Hi...
I don't if you already solved you problem but, probably, if you have router which broadcast both band with the same SSID you have option, in router settings, called SMART CONNECT set to the "ON"...

I found a solution that worked for me, i am using a xiaomi router and a s21
Samsung S21 Ultra 5G not connecting to 5Ghz wifi channel
Hi folks . I have a Samsung s21 ultra 5g. I can connect to the 2.4ghz WiFi but more than often I can't seem to connect to the 5ghz wifi channels .I'll have my laptop right infront of me onnected to the 5ghz wifi channel , yet my phone won't be able to the same. My router is netgear nighthawk...
eu.community.samsung.com
"in the settings of your phone / Connections / Wifi / settings of your network put:
IP-DHCP Settings
Phone MAC-MAC address type"