NTT 617 Tablet: Upgrading Android Version with Custom ROMs for Unsupported Devices

I have an old tablet NTT 617 in my drawer. None of the newer programs want to work on this system anymore. Is it possible to upload a newer android? It is known that the manufacturer does not support it anymore, but maybe a custom rom will be found?

The tablet is based on a fairly old Amlogic 8726-MX chipset with the motherboard designation: EM_M61_v6.0 The current version of the android is 4.1.1 Jelly Bean. You can look for some costum roma but I doubt that you will find something and playing and uploading anything blind is rather a bad idea without stock firmware. If you have a problem with uploading a program, it may be worth rooting the tablet. The tablet may be old, but it has a good IPS matrix for browsing the Internet and watching movies on YT, it is enough for a child to play. You can always sell, add and buy something newer.
Specification

Thanks for the answer. My tablet has version 4.0.1 and the programs I care about don't work. WHERE TO TAKE 4.1.1?

It probably won't work, but if you have it connected to the internet via wi-fi, go to the settings:
Tablet information
System Update
Check now
If Connect server fails, give back and uncheck two marked options so that they do not run in the background, the update server is probably no longer active and when the update starts, you may be able to update. It doesn't work for me.

I do not have an option like the update system at all

On the back of the tablet, enter:
EAN CODE:
Art.No:

This tablet is supposed to be in 2 versions, let's make sure you don't have the basic one.

EAN 5900626452879
PDANTT61701

I have:
EAN CODE 5900626752879
Art no: PDANTT61701

If you wrote down EAN CODE well, it turns out that I am not mistaken that you have the older version from 2012 NTT 617 And there is android 4.0 from what I can see and the version from 2014 NTT 617A 7 4.1
But it is probably also that I have the firmware loaded from the second tablet because I do not have 16GB, but 8GB, as in this version. On the sticker on the box, I have information that the system is updated. Probably the manufacturer after some time released an update that was not uploaded in the first period of sale. I wrote to NTT, maybe they will make the update available because I know that it was once available.

hello, I have this ntt 617a only that only the logo comes in and it does not surprise you. and because of this problem I am looking for firmware for it ... maybe you know where I can find it?

First enter recovery mode and perform Hard Reset
that is, both WIPE options