Can I use LATCH and the vehicle seat belt at the same time to install the car seat?
No, you must never install the child restraint using both LATCH and the vehicle seat belt simultaneously. Using both together can cause slack in a sudden stop or crash, which may result in serious injury or death. Use only one method at a time. (Page 13)
From the official Evenflo Symphony All In One Car Seat manual, page 13
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