[MT8127] LeapFrog Epic (bootloader unlock help needed)

[huckeberrypie]

Has anyone messed around with this device? Got my hands on a pair courtesy of a friend of mine, and for some reason they came with a ROM used for store demo units. Said friend is asking me if I could do something about it, but the problem is I couldn't find any working retail ROMs yet, and the one I downloaded off NeedROM doesn't work as SP Flash Tool refuses to install it due to a locked bootloader. I keep on getting "brom error : s_security_secure_usb_dl_image_sign_header_not_fou nd (6045)" errors in SP Flash Tool regardless of version.
Other than that I am interested in doing some work on this rather underappreciated device. There's a thread on XDA about the Epic, but thought I'd spread the word even further and pool some resources.

Here are some images and specs:




Display: 7-inch capacitive touchscreen
Resolution: 1024x600
Operating System: Based on Android™ 4.4 (modified, of course)
Processor: Quad-core, 1.3 GHz (reported by CPU-Z as MediaTek MT8127)
Memory: 1GB RAM
Storage: 16GB
Micro SD Card Slot: Yes, expandable up to 32GB
Camera - Rear: 2MP
Camera - Front: 2MP
Audio: 3.5mm stereo jack with microphone
Wireless: Wi-Fi 802.11 b/g/n
Bluetooth: Bluetooth 4.0
Battery Type: Rechargeable lithium-ion
Battery Life: 6+ hours; results will vary based on usage and settings
Port: Micro USB
Sensor(s): Accelerometer