Direct answer
For the Bose QuietComfort Earbuds II, model eligibility, battery, storage, network and paired state should be stable. First, record current versions and exact message.
What this covers
- Bose QuietComfort Earbuds II (870730)
- Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- The specific fault this record addresses: app or firmware update will not complete
What it does not cover
- ×The same symptom on a different Bose product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The battery is too low to update
What separates it The update refuses to start, or fails part-way.
How to confirm Most devices require a minimum charge before updating, because an interruption mid-write is damaging. Charge fully first.
- 2
The device went out of range or slept during the transfer
What separates it The update fails at a different point each attempt.
How to confirm Keep the phone next to the device, with the screen on and the app in the foreground, for the whole update.
- 3
The earbuds were not both in the case
What separates it An update that will not start on earbuds.
How to confirm Many earbuds require both buds present and charging, since both need the new firmware.
- 4
The app itself is out of date
What separates it The update is not offered, or the app cannot see the device.
How to confirm Update the companion app first; it is a common prerequisite.
- 5
The device is connected to another source
What separates it The app cannot take control of the device to update it.
How to confirm Disconnect it from every other device so the phone running the update has sole control.
- 6
The update is staged and rolling out gradually
What separates it A version is known to exist but is not offered.
How to confirm Firmware rollouts are staged over weeks, so a device can legitimately show nothing available.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- The charge level at the time of the attempt.
- Whether it fails at the same point or a different point each time — a different point means an interrupted transfer.
- Whether the companion app itself is up to date.
- Whether the device is connected to anything else.
Charge the device fully before starting
ReversibleMost devices require a minimum charge, because interruption mid-write is damaging.
Keep the phone beside the device with the app in the foreground
ReversibleBackgrounding the app or walking away is the most common cause of a transfer failing part-way.
Put both earbuds in the case for the update
ReversibleBoth buds need the firmware, and many models will not start unless both are present.
Update the companion app first
ReversibleAn out-of-date app is a common reason an update is never offered.
Disconnect the device from every other source
ReversibleThe phone running the update needs sole control of it.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- 870730. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- Type — ANC Bluetooth earbuds (battery)
- Bose's standard flagship-ANC earbuds (no Immersive Audio — that is the Ultra) with a charging case. Battery/ANC/Bluetooth and earbud-specific symptoms (fit, tips, case contacts) apply.
- Fit & CustomTune
- Fit bands plus ear tips, with CustomTune calibration at insertion; ANC and bass depend on the seal, so wrong-sized tips/bands are the usual cause of thin sound or weak ANC.
- Case & battery
- Buds charge in the case; dirty case contacts leave a bud starting low. ANC on at high volume shortens runtime.
- Power path
- Internal or removable battery. Every capability that costs current — night vision, higher stream quality, longer recordings, frequent events — is paid for in runtime, so a change in behaviour after a settings change is usually a power consequence rather than a fault. Cold weather reduces usable capacity sharply.
- Symptom boundary
- This record covers Bose QuietComfort Earbuds II when it app or firmware update will not complete. A different symptom on the same hardware, or this symptom on a different Bose product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Do not power off a device or close the app while firmware is actively writing — an interrupted write can leave an accessory unusable.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Bose Support publishes this as "QuietComfort Earbuds II: updating your earbuds". Bose's own article for this symptom on this product. The title here is read from the article's URL slug: support.bose.com serves the <title> "Customer Support" on every page, so there is no published title to copy. Probed 2026-08-23: 200 against a hard-404 control, which is what discriminates on this host. What that article does not carry is the model boundary — it is written for a product line, and 870730 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
One of my Bose QC Earbuds II won't charge in the case.+
Clean the charging contacts — earwax and lint on the bud's contacts and the matching pins in the case are the common cause of one bud not charging, so wipe both with a dry cotton bud. Make sure the bud seats fully in its slot (a magnet should pull it in). If a bud still will not charge or connect, reset the earbuds per Bose's steps and re-pair. The buds also pair to each other, so a dropped link between them can leave one silent.
The firmware update keeps failing part-way through.+
Failing at a different point each time means the transfer is being interrupted rather than rejected. Charge the device fully, keep your phone right next to it with the app open and in the foreground for the whole update, and do not let the screen lock. Backgrounding the app is the single most common cause.
Does this answer apply to every Bose model?+
No. It is scoped to 870730. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
What should I record before troubleshooting firmware or app?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing firmware, app. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Never interrupt an active firmware flash or use unofficial files.
Answer for the exact device and software version shown above.