Sony PS Vita - PCH-1001 - Black | 8GB Memory, Carrying Case, Game Case | FW 3.73 | eBay
How to homebrew your PS Vita in 2021
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PSVita & Switch Releases: VitaShell, Download Enabler, No Lockscreen and No Trophy Msg updated with FW 3.72/3.73 support & Serious Sam 1/2 ported to the Switch! - Wololo.net
PS Vita System Software / Firmware 3.73 is Live, Don't Update! | PSXHAX - PSXHACKS