Problem:
Magic Motorsport Flex programmer reads Peugeot 307 SID807EVO ECU ok, but can not write the modified file by OBD. It is a keyless system.

Error autohrization from ECU failed.

Solution:

The keyless ones have to see the key in the emergency key position to allow operation.

Key must be in a coil detection area, that is why you couldn’t read.

Put key in the correct compartment and try again. Put key in the slot beside the steering.

Also if manual put it in 1st drivers seat belt on and hazards

Optional Solution:

Try leaving the ignition on even when it asks you to turn it off, or disconnect the battery for a while and try again.

Play around with ignition on off timings. Don’t wait for flex, when it says ignition on click ok and then wait around 5-5 seconds before you turn it on. If you’ve done any resets with diag make sure ignition off for 2 minutes before you connect flex
SID87 EVO if password protected can be done obd, if non password protected boot only,, should still connect to update to latest software.

User feedback:
Disconnected battery for some time did the fix and worked