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List of Hardware Revisions
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HackRF One r1–r4
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The first revision of HackRF One shipped by Great Scott Gadgets starting in 2014 was labeled r1. Subsequent manufacturing runs incremented the revision number up to r4 without modification to the hardware design. Manufacturing years: 2014–2020

HackRF One r5
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This experimental revision has not been manufactured.

HackRF One r6
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SKY13350 RF switches were replaced by SKY13453 due to component availability. Although the SKY13453 uses simplified control logic, it did not require a firmware modification. Manufacturing year: 2020

HackRF One r7
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SKY13453 RF switches were reverted to SKY13350 due to component availability. USB VBUS detection resistor values were changed to better protect the LPC4320. Manufacturing year: 2021

HackRF One r8
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SKY13350 RF switches were replaced by SKY13453 due to component availability. Manufacturing years: 2021–2022

Hardware Revision Identification
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HackRF Ones manufactured by Great Scott Gadgets have the revision number printed on the PCB top silkscreen layer near the MAX5864 (U18).