The 3 flash patterns that I see on my HC05 (ZS-040) modules are:
- rapid on, off flash (2 Hz ish) >> communication mode, not connected.
- 2 rapid flashes (on, off, on, off, takes ≈ 1 second) then a pause (off) of ≈ 2 seconds >> communication mode, connected.
- slow flash, ≈2 seconds on, ≈2 seconds off >> AT mode
OP, is number 2 the pattern that you are speaking of?
Can you post photos of the HC05 front and back, please?