Hi,
when do you want to do this ?
Open those links as parallele tabs in your brownser.
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[HOWTO] an Unified Install Guide Project for /e/
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[HOWTO] revert your Fairphone 3 with /e/-OS back to Stock ROM using Debian based GNU/Linux
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[HOW-TO] Flash /e/-OS on Fairphone 3 using Debian based GNU/Linux
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What /e/ version do you goal ?
e-r-dev(android11-based) or
e-q-stable(android10-based)
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[official instructions] : Install /e/ on a Fairphone FP3/3+ - “FP3”