I don't think you did, because nowhere do I say you need an SD card. You need a PC, a USB male-to-male cable (to connect the box to your PC), USB Burning Tool, and the firmware in .img format. Everything you need is listed in my post above.
Also, you asked about rv112, but flashed to rv109? Which firmware did you attempt to flash?
There are basically two different methods of flashing this box, one requires an .img file (USB Burning Tool method). The other method requires a zip containing 3 files (.aml, update.zip, recovery file etc.,) and can be updated through the update/backup app. Just put the 3 files on a USB/SD Card, launch the update/backup app, locate the update.zip file and it should reboot and update.
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