Downgrade 11 A15 to U via A14

To find your device product codename you can run this command in the console of an adb enabled PC with you phone connected via a usb data cable (and "USB debugging selected in developer options)

adb shell getprop ro.product.device
Retail Branding Marketing Name Device Model
OnePlus OnePlus 11 5G OP594DL1 CPH2447
OnePlus OnePlus 11 5G OP594DL1 CPH2449
OnePlus OnePlus 11 5G OP594DL1 CPH2451
OnePlus OnePlus 11 5G 中国版 OP591BL1 PHB110
OnePlus OnePlus 11R 5G OP5961L1 CPH2487

according to Info about salami | LineageOS Wiki, salami cover :
Capture du 2025-07-03 01-34-19

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announced for this month !