Example: now you have listings under the brand Romashka. A year after sales, you apply for registration of the TM and find out that the brand for your products is taken. You apply for registration of the trademark Mak, register the Brand Registry, and then try to connect the existing listings to the Brand Registry. Still, nothing works, so you end up contacting support and get the standard answer:
To solve this problem, you will have to do a lot of monotonous work not to lose the information accumulated on the listings for a year of sales.