Third-party status
WorksBottle-fed: no cartridge chip to block
Yes. The ET-4850 is filled from T502 bottles, so there is no cartridge chip for firmware to reject. Epson itself says EcoTank printers avoid its cartridge restrictions. The risks are print quality and warranty.
What to do now
- Use ink sold for T502 EcoTank printers and refill before a tank runs dry.[2]Ink quality varies between sellers.
What to buy instead
- Genuine Epson T502 bottles. The safe default, and keyed to fit.
- Compatible T502 bottles. Cheaper. Pick a seller with a return policy.
- Account required
- No
- Cartridges
- Epson T502 ink bottles
- Blocking firmware
- None reported
- Last checked
Also applies to: Other EcoTank models that take T502 bottles, such as the ET-2850 (check your bottle number).
Third-party and remanufactured cartridges
- Epson says its cartridge printers are designed for Epson cartridges only, and that such restrictions can be avoided with cartridge-free EcoTank printers.[1]
- Epson lists T502 ink bottles for the ET-4850.[2]
- Tank & Toner, a review site, says EcoTank printers are bottle-fed with no cartridge chip.[3]
Epson account and subscriptions
- We found no Epson requirement for an account or subscription to print.[2]
Firmware that blocked cartridges
- We found no source tying an EcoTank firmware update to blocking third-party ink. Epson's update warning is aimed at cartridge printers.[1]
To see your version, print a printer status report or open the printer's web page. Compare it with the firmware list.
Workarounds that sources back up
- Use ink sold for T502 EcoTank printers and refill before a tank runs dry.[2] Ink quality varies between sellers.
What does not reliably work
- There is no chip to reset or swap. Problems with third-party bottle ink are about ink quality, not firmware.[3]
What to buy instead
- Genuine Epson T502 bottles. The safe default, and keyed to fit. Shop
- Compatible T502 bottles. Cheaper. Pick a seller with a return policy. Shop
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What we could not verify
- Long-term print-head wear with third-party bottle ink.
- Any dated ET-4850 owner report on current firmware.
- How Epson handles warranty claims when third-party ink was used but not shown to cause the fault.
Know something we missed? Dated sources beat opinions. Corrections go on the page with a date.
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Sources
- Epson: information about third-party ink (read Oct 21, 2026)
- Epson FAQ: ET-4850 ink bottle part numbers (published Aug 5, 2021)
- Tank & Toner: which printer brands let you use any ink (read Oct 21, 2026)