Fujifilm X-S20 compatibility and firmware guide

current firmware

v3.3

Released July 2025

lens mount status

Fully compatible — X-mount

Fujinon, Sigma, Tamron, Viltrox tested

Firmware history

Version

Release date

What changed

Worth updating for?

3.30

Downgrade

FUJIFILM Camera Remote deactivated

No – you loose camera remote

3.20

Fixes bugs

XF16-55mmF2.8 R LM WR II fixes

If you have that lens, photo features

3.10

AF algorithm partially revised

improved focusing accuracy / subject tracking performance

Does it really improve AF?

3.00

Reala Ace added, AF false positive

Some freeze issues fixed, false positive AF bug fixes

Yes – for Reala Ace + AF bug fixes

Lens quick list

  • FUJINON  XF 23mm F2 R WR — native, full compatibility
  • FUJINON  XF 50mmF2 R WR — native, full compatibility
  • FUJINON  XF 18-55mm F2.8-4 R LM OIS — native, full compatibility
  • FUJINON XF 70-300mm F4-5.6 R LM OIS WR — native, full compatibility
  • Viltrox AF 33mm F1.4 XF — 3rd party, full compatibility
  • Tamron 17-70mm F2.8 Di III-A VC RXD — 3rd party, full compatibility
  • Sigma 100-400mm F5-6.3 DG DN — 3rd party, full compatibility

Known quirks

  • From FW 3.30 you cannot manually revert to older versions of FW

Written and tested by Gregor. Firmware and compatibility notes last verified: 8.2026. Reviewed every 1–2 months.