How can I restore my phone android model 18550 to factory reset

Force reboot or reset will help.
But be careful, you should definitely backup your Android data before the reset or factory reset.
Things You Dont Know About Factory Reset Android Phone and Tablet...

Option 1: Recover Android Data from Google

If you have set up Google account on your Android and enabled synchronization for all data, after factory reset, you can set up your Google account again on the phone. An option during the set up process will allow you to restore all the synced data.

Option 2: Restore Android Data from Backup

Many Android phones are endowed with local back up app or function. If you have backed up data regularly, then, after factory reset, just go to "Settings" > "Back up & restore", and select the latest backup file to restore data from backup.

Method 2: Android Data Recovery after Factory Reset without Backup Unfortunately, you might performed factory reset accidentally without backup, or the backup file lost or failed to be recognized by your phone, or some data couldn't be backed up, etc. If you come across any one of these situations, a professional data recovery software, Gihosoft Android Recovery Free, will do you a favor. With it, you can not only recover photos after factory reset on Android devices, but also other erased data. Moreover, it supports Samsung Galaxy S8/S8 +/S7/S7 Edge/S6/S6 Edge/Note 5/J7/J5, HTC 10/A9/M9, LG V20/V10/G6/G5, Sony, Motorola, Google, Huawei, ZTE, OnePlus, etc.

Fore more info, check this link https://www.gihosoft.com/android-recovery/recover-data-after-factory-reset-android.html

Differnt hard reset/factory wipe methods for tablet pc, Hard reset or factory wipe is amethod of formatting any android device ( tablet or mobile). by doing hard reset all the apps and files that are installed or created.
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[how to] perform a factory reset - acer android tablet forum, Do not perform this factory reset procedure if you have an unlocked tablet and/or a custom recovery!!!! the factory data reset is a standard feature in android devices.. S7 factory data reset - southern telecom, S7 factory data reset if you have set a p.word on your tablet and forgotten the p.word, follow the instructions below to reset the tablet.How to factory reset an android tablet - pc advisor, Factory reset android tablet,google, android, tablet comments. lordganzgee said: i cant go to setting optionshow to reset my google account or p.word in my tablet.

What do you mean by reset? Are you trying to restore back to factory default? Also, what model of phone do you have and what OS is on it (android, windows)?

If you want to reset the factory setting and erase all materials, please press Settings/ Privacy/
Factory data reset.
Warning: Factory data reset setting will delete your Google account, data and
configuration of system and applications and applications from downloading.
Please use this function carefully

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How to Factory Reset Your Android Phone or Tablet When It Wont Boot

Hi, it is possible to solve with the following service for your phone model: http://www.fastgsm.com/en/samsung/samsung/samsung-a707/unlock-code/network-unlocker/network-unlock