perhaps they are privatized or are sold to a private company. Change the build a bit and, boom export it to the third and second world en mass.
The automaker that built the Trabant did transition into a privately owned company although it no longer builds Cars and is now only a supplier of Automotive components (Mainly supplying components to Volkswagen).
A massive amount of financing would also be absolutely needed as well for the Trabant to survive (To develop the replacement model and to rebuild the production facilities).
The process that would be needed for the Trabant to survive
1. - The automaker is sold off to new ownership (Preferbally owners who have the sufficient financing necessary).
2. - Development of a new modern and advanced replacement is started.
3. - Production of the existing out of date model ceases.
4. - The production facilities get completely rebuilt from the ground up (The work needs to be started right after the final out of date Trabant rolls off the assembly line).
5. - The workers that do get retained (Likely the best and elite of the staff) are thoroughly retrained in the new assembly processes that get implemented and be trained in proper quality control.
6. - Once the new production facilities are completed immediately start gearing up production making sure that the bugs in regards to product quality and the production process get eliminated and introduce the new models to the public.
7. - After the product introduction is done and the vehicles rolling off the assembly line meet the proper quality standards the new models get shipped out and go on sale afterwards.