I needed a small device to control my Home Assistant Setup. So I opened the drawer with the old smartphones that we all have, and naturally, I found two Nokia 6.1 phones.
Since the last Android Version that Nokia supports is 10, I decided to install a custom ROM. Doing so, I ran into multiple problems. Sadly, you will also need to use Windows for some steps, so we will just use it for the whole process.
There are three to four steps we need to perform. First, we need to unlock the bootloader. Then, we need to flash a new recovery image. Third, we flash a custom ROM (I will use LineageOS 21). Lastly, we can install official Google apps like Google Play or YouTube if you want.
Disclaimer: Following this guide will WIPE ALL YOUR DATA. I can’t take any responsibility for any damage to your device. What worked for my two phones will likely work for you, but there is no guarantee. Some features will not work with an unlocked bootloader or a custom ROM, such as paying with Google Wallet or using ID Austria.
Sadly, we have a huge issue with stray dogs 
. They can get quite dangerous, especially in the nights or when there’s too much heat outside, even in large cities. Best is to avoid side streets or neighbourhoods at the outskirts during night. If you plan a bike trip in villages close to a large city, try not to get back too late in the evening.
You can use your card pretty much anywhere in large cities or even some small towns, but you’ll probably need some cash when entering small shops, artisan shops, some bus tickets (only for some routes), etc.
Getting around public transport can be easy with mobile phone apps. This will depend on the city, but for most large ones, you can use the 24pay app, works with international banks and mobile phone numbers as well.
for travelling by bus, you can get your ticket online at: 
mind that you’ll most likely need to still print your ticket (we’re not yet at the qr-scan stage, even if the tickets have a qr code 
)
for travelling by train, you can either get your tickets from vending machines in the train station (multiple languages available, otherwise, even in large cities, it’s hard to navigate without knowing Romanian…) or through this app: 
Language side might be a bit difficult if you plan on being away from big cities, some translation app might come in handy 
. Young people in cities are likely to speak English and in some cities (Timișoara, Cluj-Napoca, Sibiu, Brașov) you can get by with German as well, probably, as there are some German communities around.