Symbian-Developers

Sis editor is easy and direct to edit sis/sisx file from your phone.you can create new sis file,pack/ unpack,signing unsigned sis file and other.
If you own unhacked phone this app is best solution to install unsigned sis file. you can sign "unsigned apps, games,themes." with certificate which contain in sis editor.3 certificate contain in sis editor is bindpda,selfsign,siscontent.i recommended you sign sis file with bindpda certificate.good news is you can add more certificate there.
If you get problem with certificate issue when you instal any sis file such as certificate error,out of date,and other.you only remove old certificate and sign the new certificate.