When you first installed the set of refill carts into your 3880, were all carts recognized correctly, except the LLK was flashing with the "Please install the correct cartridge" error? Is your printer in MK or PK mode?
When you replaced the LLK reset chip and reinstalled the cart, the LLK was recognized by the printer, but now PK is flashing?
What is the exact error displayed on the printer's LCD panel now with the PK icon flashing?
Please make sure the labels on the sides of all carts are secured to the carts and not peeling back, press all chips down to make sure they're all the way down on the carts, then reinstall the set of carts into their correct slots and close the cartridge bay door to check the cartridge read. If the PK error continues, open the cartridge bay door, remove the PK refill cart and reattach the Epson PK chip onto the PK Epson chip, reinstall the Epson PK cart/chip (along with 8 other refill cart) and close the cartridge bay door to see how the printer responds.
Please let me know if you have any questions or your results so I can help you get back to happily printing.
Best regards~ Dana