| ubi-io-read-vidhdr-pre(m, apebs), abs(pebs, apebs), ubi-io-inv(apebs), m0 = EB_PAGE_SIZE, mtd-cons(pebs), avhdr = avhdr0 ⊦ ⟪ubi_io_read_vidhdr#(m, m0, pebs; avhdr; bitflips, err)⟫ ⟨aubi_io_read_vidhdr#(m, apebs; avhdr0; isbad, err0)⟩ (abs(pebs, apebs) ∧ avhdr = avhdr0 ∧ (bitflips ↔ isbad) ∧ err = err0) |