Brightness setting not working

Hi Geoffrey,

We understand the issue you are facing and will assist you.

I suggest you to follow the steps provided below and check if it helps.

1. Charge your phone

Charge your phone for at least 20 minutes.

Press and hold the Power and Volume down keys simultaneously for 10-15 seconds. Release and the phone will restart. After this operation, you may need to set the date and time on the phone.

3. Reset your phone

Before continue with the reset, make sure your phone’s battery level is above 50%.
To check the remaining battery life, go to Settings > System > Battery saver (Lumia with Windows Phone 8: Settings > battery saver). If you are not able to check it, or the level is too low, charge your phone for at least 20 minutes.

Reset your phone by using the phone settings.
Select Settings > System > About > Reset your phone (Lumia with Windows Phone 8: Settings > About > Reset your phone).

However, if you cannot access the phone settings, follow the steps below:

1. Disconnect the charger. Press and hold the Power and Volume down keys simultaneously. Release the keys when the phone vibrates and then immediately press and hold the volume down key until the phone displays an exclamation mark (!) on the screen. Release the volume down key.
   
2. Press the volume and power keys in the following order: volume up, volume down, power, and volume down.
   

   Lumia 950 XL users: the physical key combinations differ slightly compared to other Lumias.

3. Wait for your phone to reset. During the reset you will see gears rotating on the screen for up to 5 minutes, after which the screen goes blank for ~30 seconds and then your phone will restart.
4. Go through the initial phone setup. Make sure that you have the date and time set correctly. Select Settings > Time & language > Date & time (Lumia with Windows Phone 8: Settings > date+time).

Hope this helps. Keep us posted on the status for further assistance.

hi eeshwar 

i have already tried the hard as well as the soft reset 

Hello,

We apologize for the delay in response.

I suggest you to check the correct option for troubleshooting steps to display and follow the troubleshooting steps  and check for status.

Lumia troubleshooting and repair 

https://support.microsoft.com/en-us/help/10280/lumia-troubleshooting-and-repair

Keep us posted on the status for further assistance. 

Hello,

We are sorry that you are still facing the issue.

I suggest you to follow the steps provided below and check if it helps.

1. Power down your phone.
2. Remove battery.
3. Remove sim card.
4. Start WPRT without battery.
5. Connect USB cable to pc.
6. This will install emergency package to ur phone.
7. Click on model number again when it shows and low battery sign will come and press continue.
8. if u still get error like what is gone though just repeat the steps. 8.1 will be installed to ur phone.
9. Put back battery to ur phone and continue re-registration of ur phone.

Hope this helps. Keep us posted on the status for further assistance. 

Thank you.