Jawbone

What worked

Defined three consumer-hardware categories in succession: premium Bluetooth headsets, portable Bluetooth speakers (the Jambox held roughly 45% of the US wireless-speaker market per NPD), and early fitness bands with the UP.
Raised roughly $930M from Sequoia, Khosla Ventures, Andreessen Horowitz, Kleiner Perkins, BlackRock, and the Kuwait Investment Authority, peaking at a valuation around $3.2 billion in 2014.
Turned Lawrence Livermore noise-suppression research funded by DARPA and the Navy into a genuine technology moat in voice audio.
The 2011 UP refund program — full refunds, keep the band — was hailed as a masterclass in hardware crisis management and preserved the brand for the UP24's successful relaunch.
Acquired BodyMedia for over $100M in 2013, bringing 80-plus patents and clinical body-monitoring expertise into consumer wearables years before the industry's medical turn.
With Yves Béhar as creative partner, became one of the most design-celebrated hardware brands of its era, collecting museum placements and defining the look of 2010s gadgets.

What broke

Serial manufacturing failures at the worst moments: the original UP bricked en masse at launch in 2011, and the UP3 shipped six-plus months late with downgraded waterproofing and a heart-rate sensor limited to resting readings.
Lost the wearables war to Fitbit on every front — down to roughly 2% of fitness-tracker shipments by 2016 versus Fitbit's 22%-plus, and out of IDC's top five vendors.
Its legal offensive collapsed: the ITC invalidated Jawbone's patent claims in April 2016 and ruled in August 2016 that none of its 154 alleged trade secrets had been misappropriated by Fitbit.
Death by overfunding: ~$930M including layered debt — BlackRock's $300M carried a senior liquidation preference — kept the company alive past its market relevance and made a clean sale impossible; the January 2016 KIA round halved the valuation to $1.5B.
Perpetual reinvention without a profitable core: headsets to speakers to fitness bands to a clinical-grade pivot that never shipped, each transition abandoning the revenue base of the last.
Operational collapse preceded the legal death: production stopped and inventory was sold off to a reseller in mid-2016, the customer-service vendor quit over unpaid bills that September, and liquidation in 2017 left UP owners with devices whose servers simply went dark.