shady Error: -1073545212 (STATUS_PRELOADER_INVALID)
This error is related to the secure preloader checking from the device with preloader you load from firmware which have different version, so you have try the same firmware version to get success flashing or identify.
I personally got the same problem with Oppo F5. My Oppo F5 have software version A.33, I try to flash it with previous version A.18, and the latest version A.36, all of this firmware end up with above error.
Finally I got success with firmware version A.31.
This Oppo Device also have some weird issue, opposite by most theory, from the log above, this preloader doesn't have correct cid, but the phones still can boot normally. And, I guess only their engineer can explain this