flashing apple logo white screen
After updating to IOS 14 on iPhone 6splus, phone started acting up. Now I have a flashing screen. 1st it's white with a black apple logo on for maybe 15 seconds, then off & black for 3-4 seconds. Just keeps doing this over & over. Tried shutting off & turning on again, nothing changes. The IOS 14 update really messed up my phone & I don't know what to do. Googled the problem & tried every solution offered. Some want me to pay to download a program that supposed to fix the problem but I don't trust the programs. Can anybody help me, please??
iPhone 6s Plus, iOS 14