A Solo 401(k) plan document the legal framework what sets up a Solo 401(k) plan, retirement trust, and lets you open vehicles to invest through your plan.
Rocket Dollar will issue new plan documents that a pre-approved by the IRS. These will replace your old documents, and Rocket Dollar will take over as your new administrator.
If you were no longer satisfied with Rocket Dollar, you would be able to do the same process with another Solo 401(k) provider. If you had self-directed assets held in the plan that you do not want to sell into cash, you might have to make sure you found a Self-Directed Solo 401(k) provider so you can continue to hold those assets with proper compliance.