Help Flashing TWRP onto my Oppo Find 7a (X9006) topic

I tried earlier today to flash TWRP custom Recovery onto my Oppo Find 7a (X9006).

i have sideloaded and so on my LG Optimus G (E975), LG Optimus 2x (P999), Google Nexus 7 (2013) (flo) before and also oem unlock so i know a little and unlocked bootloaders before but never really on my Oppo, so here it goes.

I can find my Oppo with fastboot devices not a problem:


so that's not a problem, the problem comes when i want to flash TWRP, i get this error:


Anyone can tell me why i get this error? I am running ColorOS 2.0.0i and Oppo Recovery v1.2

I have tried different unlocks from here and Oppo's forum but none seem to work properly for me, i just get the error above.

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