Hi @Luffy
Just to make it clear, it is not possible to ‘renew’ the residence permit 104c. It is issued once only and cannot be extended. What you are hoping to do is to change your residence permit from 104c to 25b. You have correctly listed the requirements for 25b. However, if you **** at the legal basis for this permit (paragraph 25b of the Aufenthaltsgesetz), you will see that exceptions can be made to these requirements.
Here is the legal text in English:
https://***.gesetze-im-internet.de/englisch_aufenthg/englisch_aufenthg.html#p0764
You’ll see in section three, it says that the requirement for financial independence must be waived if not possible due to physical illness. This can be shown in different ways. Your doctor can provide an assessment on your ability to work or not. You can also apply at your local Sozialamt to have your level of disability (Grad der Behinderung) assessed. If the level of disability is determined at least 50%, then you can apply for a Schwerbehindertenausweis.
You can also request that your ability to work is assessed by the employment authorities. I presume you are in receipt of benefits from the Jobcenter. The Jobcenter has its own team of medical staff called ‘Ärztlicher Dienst’ who in some cases are requested to make an assessment. You speak with the person responsible for helping you find work (from the ‘Vermittlung’ team there) to arrange this assessment. If they determine you as being unable to work (erwerbsunfähig), then this is also proof you can use in your application for 25b.
I wish you well with your health and application for 25b. Let us know if you have any other questions.
Best,
Éanna