Are you printing from a Mac? If so, you will need to run the R2880-K7 install command to print to the new printer, even though it's the same model. The new printer must be on and connected to the computer when you run the install command, for successful install.
In regards to your previous resetter question, just to clarify: the batteries are on the same side of the board that the pins stick out (you have to pull the green computer board out of the plastic case to access the three round batteries). I'm glad it's working now, though not sure why it wasn't before. Yes, you have to slightly push the resetter and cartridge chip together for a good connection to successfully reset. The chip is how the printer knows how much ink is in a cart, it can not see the actual ink in the cart. For example, a new/empty cartridge chip reads full, so if you didn't fill the cartridge and just installed an empty cart, the printer would think it's full because the chip says so. If you have been using carts, and the printer indicates one is empty and needs to be replaced, if you just remove and reinsert the cart with out refilling, the chip would automatically reset and the printer would see it as full (even though it's not). For accurate ink level tracking, and to avoid running a cartridge dry, it's best to only reset cartridge chips when refilling carts with ink- so the physical ink level matches the chip read. I personally like to refill multiple carts at once, so use the chip resetter to manually reset chips after refilling.
I hope this helps, please let me know.
Best regards~ Dana