If you have unlocked your zong mifi (e5573s-320) or PTCL charji (ec5377u huawei model) and want to remove the update popup so that you accidentally don't click on update and again lock your device. Ptcl and zong both have released update jo aap ki unlocked device ko dobara lock kardega. Agar aap chahte hai apni unlocked device ko permanently lock rankhna tou is dropbox ki link sai file download karre aur mere instructions ko follow karre
https://www.dropbox.com/s/hdc33wzfip...harji.rar?dl=0
A) Sub sai pehle custom firmware install karne kai liye aap ko apni ptcl charji ya zong mifi ko debug mode mai daalna hoga. Agar aap zong ki device e5573s-320 ko karna chahte hai tou zong kai folder mai driver 5.01.06.00 ka folder hoga usme sai driver install karle. Phir device manager open karre aur usme ai device ports kai name sai arhi hogi. maine picture daali huwi hai uski. Agar ports ka option na arha hou aur huawei ki ko device banni hou jis par yellow caution ka sign bana huwa hou tou aap driver pack solutions ya kisi aur driver software kai through install karle uss driver ko phir ports ka option ajayega. Agar device manager mai kuch bhi nhi arha hou tou apni zong mifi ya ptcl charji ko connect karke huawei hi silicone open karre aur ok karte rahe hai. Open hone kai baad woh device detect karlega aur aapki device debug mode mai chali jayegi. Debug mode mai jaane kai baad device manager mai ports ki device na aye (uski pic hai download mai) aur huawei ki koi device aye aur yellow caution bana huwa hou tou aapkou manually driver daalna hoga. I personally used driver pack solution to install that driver.
 B) Jab aapki device debug mode mai hojayegi aur device manager mai ports ka option ajayega tou aap phir agar zong use karahe honge tou zong e5377-320 huawei original firmware ka folder open karre aur usme software ka folder open karke prod&serv&cust wala folder open karre. Usme update_webui_17.100.11****.exe hoga. Woh open karre aur update wizard open hoga. Phir click start to update par click karre and when the firmware installation khatum hogi, aapki device restart hogi aur phir pc sai connect hone kai baad khudi 192.168.8.1 open hoga. Usme top left corner par zong ki jaga huawei likha hoga aur huawei ka option hoga. Iska matlab aapka webui original huawei ki device ko hogaya hai aur apki unlocked device phir permanently unlock hojayegi. Aur update ka notification jo bar bar ata tha woh bhi nhai ayega. Agar aye tou ap check for updates par click karna. Uss par likha ayega device is update to date.
C) Agar aap unlocked PTCL charji ec5377u use karahe hai tou uski screen par bar bar update ka notification ata hoga. Agar devic eghalti sai update karde tou woh dobara lock hojayegi. Iska ilaaj yeh hai kai A kai instructions foll karke uskou debug mode mai daal aur file jo download karenge usme ptcl ka folder hoga. Ussai aap sai aap huawei ec5377u ka folder open karre aur uske andar update wizard.exe hoga jo aap open karre aur start par click karke intizar karre. device jab restart hogi installation finish hone kai baad tou phir laptop par connect hone kai baad 192.168.8.1 open hoga. Usme Ptcl charji ka webui huawei ko hojayega aur ptcl charji ki jaga top par huawei likha hoga. Iss tarah aapki already unlocked device permanently unlocked hojayegi aur phir update ka option aapkou kabhi bhi tung nhi karrega aur aap freely device use karsako gay. (ec5377u kai custom firmware kai aik chinese profile default hojayegi. Uski wajah sai ptcl ka net disconnect hojayega. aapkou ptcl ki profile banani parhegi. Profile settings par jakar new profile par click karna. Name PTCL charji. User name vwireless@eagle.com , password ptcl , apn eagle.com .Jab profile ban jaye tou select karliyega aur agar ptcl ki sim use karenge tou aap har bar jab bhi device restart karrenge, apkou ptcl charji ki profile select karni parhegi) (firmware huawei ka original hojayega tou woh ptcl ki sim kai name ki jagah aik number 45101 ya kuch aisa show karrega lekin baaki sub sims ka sahi name show karrega plus agar koi aur network ki sim use karrenge tou aapkou profile bhi aapkou baar baar change nhi karni parhegi)
Note: These instructions are only for already unlocked charji ec5377u and zong e5573s-320. If you have updated your device tothe latest firmware from zong on your mifi and from ptcl on your charji, there is no use of following the instructions. If during firmware upgrades, the setup asks for password, use the mastercalculator in the zong folder to find the flash code. Input your imei and it would give you a flash code. Copy that flash code and paste it in the password dialog of the upgrade wizard)
Umeed karta hou yeh insturctions aapke kaam aye aur aap uss update notification ko remove kar sake enjoy. I'LL also answer your questions if you have any.
Credits: @depthcharge 's comment and @salluhassan 's thread