Energy eReader Pro+ / Boyue T62+: dead black pixels

[Scalpos]

I received few days ago a Energy eReader Pro+ (rebranded Boyue T62+) from Spanish company Energy Sistem. I needed to replace my beloved stolen Sony PRS-T1. The first device arrived DOA, with a broken screen displaying some white lines (the device's box was simply slipped into the transporter plastic bag...). The second one was luckier, even if its box has suffered from the lack of protection too. But my concern is about the screen, it shows myriads of what looks like black pixels all over its surface. They're not due to ghost effect as they're still here after a forced screen refresh. Additionally the screen looks a little bit uneven, kind of grainy: it is not perfectly white/grey with a blank pic. Even if those dead pixels are tiny, it is quite easy to spot them, especially when the light is on.

Has any other owner of this device noticed a similar thing ? Is it the same for all ereaders using eCarta screen ? I never had such unpleasant thing with the Sony reader.
I attached some pictures, but it's hard to make those pixels visible, especially with the 600x600 image's size limit.