was closed by saying its off the topic means which is not supposed to ask on SU

This is not true. The question was closed as not a real question by @Sathya because it was very vague to begin with. It doesn't even mention what kind of phone is involved. It is not off topic since it deals with interfacing a phone and a computer. That is usually fine, but the question itself is really vague. That's all.

By pointing us to the other (very popular) question, you essentially pointed out that it could be a duplicate of that, because they cover the same grounds. That's why @Ivo Flipse closed it as such.

at the same time the first question was protected by community

Do note though that the older question at least mentioned which phone was involved, so there was something to work with. Given that the problem stated in this question probably affects many people, it became popular, received 8 upvotes and over 30,000 views in the year after it was asked.

When a question receives 30,000 views, there's a good chance some garbage answers accumulate, which need to be deleted. Once a few non-answers have been deleted, a question can be automatically protected which basically just protects it from being spammed.

A question being protected does not say anything about its value. It only means that it's a potential magnet for non-answers as you can see.

TL,DR: Listen to @Sathya, and if the OP wants that question reopened, there needs to be a little more detail and what has already been tried.

The question is not off topic though.

was closed by saying its off the topic means which is not supposed to ask on SU

This is not true. The question was closed as not a real question by @Sathya because it was very vague to begin with. It doesn't even mention what kind of phone is involved. It is not off topic since it deals with interfacing a phone and a computer. That is usually fine, but the question itself is really vague. That's all.

By pointing us to the other (very popular) question, you essentially pointed out that it could be a duplicate of that, because they cover the same grounds. That's why @Ivo Flipse closed it as such.

at the same time the first question was protected by community

Do note though that the older question at least mentioned which phone was involved, so there was something to work with. Given that the problem stated in this question probably affects many people, it became popular, received 8 upvotes and over 30,000 views in the year after it was asked.

When a question receives 30,000 views, there's a good chance some garbage answers accumulate, which need to be deleted. Once a few non-answers have been deleted, a question can be automatically protected which basically just protects it from being spammed.

A question being protected does not say anything about its value. It only means that it's a potential magnet for non-answers as you can see.

TL,DR: Listen to @Sathya, and if the OP wants that question reopened, there needs to be a little more detail and what has already been tried.

The question is not off topic though.