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You can't install two firmwares at the same time and select which one to use, however if you install the LBook firmware and do not like it, you can reflash with the original firmware you had on your device (provided you have a .bin file of it).
The beauty of the Hanlin readers and firmware is, the firmware isn't incremental, it updates the entire system, so you are free to move from Astak to Jinke to LBook to BeBook and back again without issue.
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