Will not boot up and stay

@louisbrown24259 you need to treat it the same way as any other water immersed device.

The very first step would be to disassemble your phone. Use these guides ZTE Avail 2 to help you disassemble your phone. Take a look at all connectors as well as cable ends. Look for major corrosion, evaluate the pins in the connectors etc. You will have to remove all the EMI shields from your main board. If you do not remove the shields, you are not cleaning the board. Once you got any gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide. It was written for an Apple iPhone 3G but it is still pertinent to your phone as well.

I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Do not use compressed air for the cleaning since that can drive liquid as well as corrosion particles into areas that will cause trouble later on. The importance here is the cleaning. Best thing to do would be to clean it with an ultrasonic cleaner, but if you do not have access to one, this will at least help.It would of course be best to get it professionally cleaned Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. After that, reassemble your phone and re-evaluate.

For as long as you have not cleaned your board and replaced the battery, everything is just a guess. Keep in mind that water damage is the hardest to troubleshoot and to repair. It does not matter if is was exposed for 2 seconds or 2 hours, what matters is where the water (particulates) did the damage.