Message: Certificate error. Contact the application supplier.
Hint: You may have tried installing unsigned application. Note that signing is mandatory S60 3rd Edition. You can use self-signed certificate or developer certificate from Symbian Signed to sign your application.
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Message: Unable to install. Constrained by the certificate.
Hint: This message pops up when you attempt to install developer certificate in the unsupported device. The developer certificate from Symbian Signed can only be used in a limited number of devices. Remember that you have to send your IMEIs to Symbian Signed when requesting certificate. You cannot use the certificate in other devices that is not in your IMEIs list.
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Message: Required application access not granted.
Hint: Check that your certificate can be used to sign all capabilities needed by your application. For example, if you use self-signed certificate, you can only sign basic set capabilities, i.e. NetworkServices, ReadUserData, WriteUserData, LocalServices and UserEnvironment. If your application requires one of the extended capabilities, for example SwEvent, you cannot sign it with self-signed certificate. In this case, apply for developer certificates from Symbian Signed.
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Message: Unable to install a protected application from an untrusted supplier.
Hint: If you use self-signed certificate, make sure that your application uses unprotected UID, i.e. 0xA0000000 – 0xAFFFFFFF. If you use protected UID (0×20000000 – 0x2FFFFFFF) or legacy UID (0×10000000 – 0x1FFFFFFF), you will get this message.
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Message: Unable to install.
Hint: This message may come up when your installation file (.sis/.sisx) copies files to other application’s private folder, i.e. privateuid. Note that Symbian 9 introduces data caging concept, it means you don’t have access to other application’s private folder.
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Message: Expired Certificate
Hint: Set the phone date back by 7-8 months then install the application. After doing that reset the date back to routine.
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kua panu nman poh magawa yun hirap nman kc……..
Bro, pano naman pag “AUTHORIZATION FAILED”? yan kasi lumalabas pag install ko unlichat…
@master onin, java unlichat b ung iniinstall mo?
pls mrm hw wil i request 2 signed cert. from symbian signed
@fashville
I dunno. You can make your own certificate.
AntonyPranata
hw can i make my own certificate
bro..mister M..pls paKI hack naman ung fon ko…plssssssssssss di kc ko na kc ko makapagcoment dun sa post mo ng hacking fon, kaya dito nako nagcomment plsssssssssssss BRo!
@jhonroman
Wag mo din pala i-post ng paulit ulit IMEI mo. Nakakalito kaya nagtatagal ei. 
Wait lang po. Busy ako ngaun.
sorry pohhh Bro…tnx Godbless!
mr.M pano po pag unable 2 download ‘browse.sis’
@gnel09
Tuwing kelan mo na-eencounter un?
bro maraming maraming slamat sayo hack na fon ko…hindi ko lng pala na enable ung sa rompatcher…bro Godbless palagi ha galing mo talaga more power Mr. Mobile
bro parequest naman oh..paki post u naman ung rompatcher for n79..tenk u…
mR.m meon po kau rompatcher..post nio naman po link nia.
@mr.J
Iwasan mo din magpabago bago ng USERNAME. 
Meron, search mo na lang sa BLOG ko.
Boss M.d ko tlaga mainstall ang one na games s ngage ko.lagi eror.e2 talaga ang pinakanamimiss ko n game.lagi eror.pero ung iba ok naman.pls.help.
ngage 1.40_1557 .sisx ang version ng ngage application ko.at lahat n yata ng version ng engage meron ako at natry ko narin.ayaw talaga mainstall ng one n games.asar.
Boss M.ilang beses ko naring or paulit ulit ko naring binasa ang mga post/tips nyo regarding s ngage including yung ano o pano ang mga dapat gawin.
Ilang beses ko n ring tinangkang makipagkta kay broken para magpatulong dhil sya ang nagturo s akin dati.pero conflict talaga ang tym namin eh.
Meron po ako ngaung one n games pero trial version lng.at nakuha ko e2 s mismong http://www.ngage.com.ayaw po kc talaga mainstall ung cracked files natin eh.bitin tuloy ako.
@leo03
Sure? Ayaw? Pwede naman, try mo gumamit ng new version ng N-Gage App.
Several tyms n po akong nagtry maginstall n2 pero ayaw talaga.
Ganito po ang lagi sinasabi pag nagtry ako maginstall.Unable to install game (error -1)
Ok boss try uli ha.wait lang.
kuya ano naman yong update error?
@alven
Saan mo ba na-encounter un?
welldone mr m……….. but when i backdate the 5320XM, i was able to install font router manager but font router LT doesnt install!!!!!!! How do one go about signing applications?
@whales
Just return your phone to its original date.
still the same thing and i have hack the phone….. Thanx for your response!!!
sir em. pano po ausing ung error na unable to install a protected apps? ano po dapat gawin?
@mistyrain
Error sa certificate un.
sir em, ano po ba dapat gawin pag error ung cert? signed ko ung apps from freesigner pero di po gumagana? kelangan po ba ng cert ung apps na gusto ko i sign using freesigner?
@mistyrain
Hindi na, gamitin mo lang ung cert at key na binigay ko.
mister m..i tried to sign the camera sounds sa freesigner, la ako initial setup na cer and key? ano un? i think u need my imei…do u want me to post my imei sa e63 ko?
@niwniw
Request ka ng CERTIFICATE sa forum.
pano po pg update error?