@Dimitri-0 Is that version still supported?
That's a good question, but the answer needs to come from Opera.
The Nokia 216 is a 2016 feature phone that came with Opera Mini preinstalled. The phone's built in apps, including Opera Mini, are based on MediaTek's MAUI Runtime Environment, not Java ME or Symbian. I believe that Opera had a contract with Nokia or Microsoft to develop an MRE-based version of Opera Mini for these phones.
Perhaps you could reach out to Opera Mini infrastructure team and ask if MRE Opera Mini is still supported.