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

[rjbeep]

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

 

[DigitalMD]

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

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.

 

[rjbeep]

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.

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:

1. Honey Comb - Factory Installed - 5ghz & 2.4ghz worked
2. ICS - United Kingdom / Ireland - P6210XXLPN/P6210OXALPN - 5ghz & 2.4ghz worked
3. ICS - Cellular south - P6210UELPC/P6210XARLPC - 5ghz & 2.4ghz worked
4. Jelly Bean - United Kingdom / Ireland - P6210XXMD3/P6210OXAMD3 - 2.4ghz works but no 5ghz
5. ICS - Cellular south - P6210UELPC/P6210XARLPC - 5ghz & 2.4ghz worked again (downgraded)
6. 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

 

[rjbeep]

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]

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.

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.

 

[rjbeep]

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.

gotcha...
Thanks for helping me understand what's going on here. Appreciate the help.

 

[DigitalMD]

gotcha...
Thanks for helping me understand what's going on here. Appreciate the help.

No problem, If i were near a 5ghz router right now, I'd check it out and find the problem, but Im not.

 

[k_t_b]

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.

 

[DigitalMD]

[/COLOR]

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.

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