Thanks for contacting us and really sorry for inconvenience caused.
Would you please share more information about the usage scenario when you were using the phone and then boot loop appeared.
What apps were you using at that moment and what about the current software?
For boot loop, there is a self-help solution, would you like to try this official SD ROM recover?
First check the CU reference on the battery label, and then download the related SD rom and follow the guidance step by step.
REMEMBER to remove SD card first, thanks.If you have any further question, please feel free to contact us. Thanks.http://www.flash3c.com/support/flash-plus-2/download-resources/
If you have anything not clear about the SD ROM recovery, please feel free to contact us.
And you could also directly go to our service center in your city, don't forget to bring proof of purchase, such as receipt, warranty card and receipt. After technicians check your phone, they will offer help. Thank you for understanding.