Download- Byhss Ly Tyz Mhjbt Msryt Fy Alatwbys... -

Shift each letter backward by 1: b→a, y→x, h→g, s→r, s→r → “axgrr” no. Shift backward by 3: b→y, y→v, h→e, s→p, s→p → “yvepp” no.

Actually “alatwbys” — if each letter minus 1: z k s v a x r — no. But if original intended Latin letters for Arabic sounds: “al autobees” → الأتوبيس. So “alatwbys” with t instead of u? w instead of b? Download- byhss ly tyz mhjbt msryt fy alatwbys...

(download the bus in Egypt) — playing on “Download- byhss…” being a clue to decode as “Download- al autobees fi masr” but with letters shifted. Shift each letter backward by 1: b→a, y→x,

But maybe it's Atbash (A↔Z, B↔Y, etc.)? But if original intended Latin letters for Arabic

If “alatwbys” original intended = “alautobees” → “alatwbys” shift +1: a→b, l→m, a→b, u→v, t→u, o→p, b→c, e→f, e→f, s→t → “bmbvupcfft” no.

Let’s test Atbash on “byhss”: b (2nd letter) ↔ y (25th) y (25th) ↔ b (2nd) h (8th) ↔ s (19th) s (19th) ↔ h (8th) s (19th) ↔ h (8th) Result: “ybshh” — not a word.

Let’s instead guess the plaintext language is Arabic in Latin script, cipher is ROT1 (A→B). Then to decode, shift back 1: