my iphone 6 plus does not support latest ios version and front camera is not working

The iPhone 6 Plus cannot update further then iOS 12.5.6 due to hardware limitations. For the front camera not working follow these steps:

1. Remove any case, accessory, or film that might block the camera or flash or that places a magnet near the camera.
2. Test the camera by trying to take a photo.
3. Test the LED flash:
   1. Try the flashlight in Control Center on your iPhone or Control Center on your iPad. On an iPhone X or later or an iPad, swipe down from the upper-right corner of the screen. On an iPhone 8 or earlier, swipe up from the bottom edge of any screen.
   2. Tap the Flashlight button .

If the flash works only sometimes, open the Camera app and tap the flash button  to choose a different setting.

Contact Apple Support

If the camera or flash still isn't working properly, contact Apple Support to discuss service options.

mfaume ~ Does your iPhone 6 Plus still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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