I download openwrt twice over 2 different connections (ok, it´s not the right way) and compare the md5 of the 2 files.
TP-Link FW: re200v1_eu_3_14_2_up_boot(171206).bin
MD5: E95FFB14649D4DD6598DAB0423B92EA8
OpenWRT FW: openwrt-ramips-mt7620-tplink_re200-v1-squashfs-factory.bin
MD5: 8AEB40F17EE33755AF5F09F43C295F00
Output FW Tool: openwrt-webif.bin
MD5: D9147672F70F5E7D67D75AF766C97A79
Maybe i miss something, was late night and i'm was a little tired. I will do it again this night and double check everything.
To be clear, this is what i has to do:
1- In OWRT Image tool, i put in:
Original FW file: re200v1_eu_3_14_2_up_boot(171206).bin (the TP-Link stock FW)
OpenWRT Image file: openwrt-ramips-mt7620-tplink_re200-v1-squashfs-factory.bin
Output FW: openwrt-webif.bin
2- Connect to stock web interface of repeater and do a FW update with the openwrt-webif.bin, right?
I don't need to rename the file, right?