{"slug":"asus-rt-ac66u-b1-4","display_name":"RT-AC66U_B1","model_name":"RT-AC66U_B1","hardware_revision":"","region_code":"","category":"router","vendor":{"slug":"asus","name":"ASUS"},"verdict":{"status":"quiet","label":"Gone quiet","confidence":"low","reason":"2081 days of silence, past the 730-day floor that applies where there is no cadence to compare against","algorithm_version":"lifecycle-1","computed_at":"2026-09-30T02:14:47.523924+00:00","thresholds":{"quiet_days":730,"active_max_days":365,"active_multiple":1.5,"slowing_multiple":3.0,"max_gap_dispersion":1.0,"high_confidence_releases":5,"min_releases_for_cadence":3,"never_updated_min_age_days":365}},"measurements":{"release_count":2,"first_release_date":"2020-04-14","last_release_date":"2021-01-18","days_since_last_release":2081,"median_gap_days":null,"cadence_multiple":null,"observed_support":{"days":279,"is_floor":true,"measured_from":"first_release"},"promise":{"end_date":null,"is_estimated":false,"is_floor":false,"honoured":null,"basis":null},"cve_patch_latency_days":{"median":null,"measurable":false}},"releases":[{"version":"3.0.0.4.386.41634","channel":"stable","claimed_release_date":"2021-01-18","claimed_date_precision":"day","is_vendor_dated":true,"first_observed_at":"2026-08-02T11:15:35.628116+00:00","observation_kind":"live_crawl","withdrawn_at":null,"changelog":"1. Fixed Let’s Encrypt not working properly.2. Added IPTV supports for specific region.3. Fixed parental control issues. This firmware add more security protection for configuration. If you want to manually downgrade to previously version, please reset the router to default after downgraded.","disclosure_score":0.55,"mentions_security":true,"cve_ids":[],"download_url":null,"evidence":{"id":203464,"source_url":"https://www.asus.com/networking-iot-servers/wifi-routers/asus-wifi-routers/rt-ac66u-b1/helpdesk_bios?model2Name=RT-AC66U-B1","fetched_at":"2026-09-29T03:03:43.617421+00:00","observed_at":"2026-09-29T03:03:43.617421+00:00","http_status":200,"content_sha256":"2f8c4c399417c7c23e7e443e406f39227fc37e00405e56e4f0d6551deeedbfeb","html":"//firmwarewatch.cc/evidence/203464","raw":"//firmwarewatch.cc/evidence/203464/raw"}},{"version":"3.0.0.4.385.20433","channel":"stable","claimed_release_date":"2020-04-14","claimed_date_precision":"day","is_vendor_dated":true,"first_observed_at":"2026-08-02T11:15:35.628116+00:00","observation_kind":"live_crawl","withdrawn_at":null,"changelog":"1. Update Adaptive QoS categories: Help you to prioritize the mission-critical applications Those people who work-from-home & learn-from-home will greatly benefit from this new feature with optimized streaming experiences. New Supported Categories & Apps: - Video conferencing, including Microsoft Teams®, ZOOM®, Skype®, Google Hangouts®, BlueJeans® - Online learning, including Khan academy®, Udemy®, Coursera®, TED®, VIPKiD®, 51Talk®, XDF®, Xueersi® - Streaming, including YouTube®, Netflix®, HBO NOW®, Amazon Prime Video®, Disney+®, ESPN®, MLB.com®, iQIY® - Indoor training, including Zwift®, Peloton®, Onelap® Stay tuned and more apps are coming to the list soon!2. Support Mobile Game Mode - One-click prioritizing your mobile device to the highest and ensure you the best mobile gaming experiences. - Install/Update ASUS Router App (Android supports later than 1.0.0.5.44; iOS supports later than 1.0.0.5.41)","disclosure_score":0.55,"mentions_security":false,"cve_ids":[],"download_url":null,"evidence":{"id":203464,"source_url":"https://www.asus.com/networking-iot-servers/wifi-routers/asus-wifi-routers/rt-ac66u-b1/helpdesk_bios?model2Name=RT-AC66U-B1","fetched_at":"2026-09-29T03:03:43.617421+00:00","observed_at":"2026-09-29T03:03:43.617421+00:00","http_status":200,"content_sha256":"2f8c4c399417c7c23e7e443e406f39227fc37e00405e56e4f0d6551deeedbfeb","html":"//firmwarewatch.cc/evidence/203464","raw":"//firmwarewatch.cc/evidence/203464/raw"}}],"identifiers":[{"kind":"marketing_name","value":"RT-AC66U_B1","normalized":"rt ac66u b1"}],"revisions":[],"evidence":{"archived_pages":1,"first_observed_at":"2026-08-02T11:15:35.628116+00:00"},"caveats":["observed_support.days is a lower bound: it runs from the first firmware we saw, because no source here publishes launch dates.","Patch latency is not computable for this product: its changelogs name no CVE ids."],"links":{"html":"//firmwarewatch.cc/devices/asus-rt-ac66u-b1-4","self":"//firmwarewatch.cc/api/v1/products/asus-rt-ac66u-b1-4.json","vendor":"//firmwarewatch.cc/api/v1/vendors/asus.json","feed":"//firmwarewatch.cc/feeds/devices/asus-rt-ac66u-b1-4.xml","methodology":"//firmwarewatch.cc/api/v1/methodology.json"}}