[Q] [HELP] After flash, phone displays nothing ! topic

Hi, i'm using "Huawei Ascend Y210-0100", i had a problem with the dialer app so i flashed the official firmware (consumer.huawei.com/en/support/downloads/detail/index.htm?id=14221) using the sdcard, the upgrade finished succesfuly but after reboot my phone displays NOTHING but still work (sound, vibration,touch screen) ... i tried to flash again but nothing helped.
Thank you in advance for your suggestions

Different displays between D820 and D821 (worse) topic

I had a D820 from the US Play store and I just bought a new D821 from the Carphone warehouse in the UK because I wanted to use the 4G.

The displays of both models look similar but the display on the D821 is a little bit "sticky".
For example, It's hard to swipe for notifications and hard to swipe in Swiftkey. My finger feels very hard resistance.
On the D820 it's much better (actually, I like it very much there). I also compared it to other phones.

Do you also see this on your D821 or I might have a defected unit?