Sir,
thanks for your information, you have impressive knowledge regarding Defense matters and i am witness of it. can you please elaborate why there was a need for "new version" or as earlier report said "new guidance system" right after 20 successful flights . For Old version it remained into testing phase.
yes i will tell you that sir whatever the world says about brahmos the real truth it its based on a russian platform which was later enhanced and updated jointly by the indians.
as you might also come to know through this very forum that russia is updating all its soviet era missile technology with new seeker and guidance system i will site the example of the famous russian s-300 air defence system which is being updated into the s-400 platform with various new tech.
as a result of constant upgradating new platforms are being tried out, not only in india russian missiles are constantly being tested in russia every month, many of them failed in primary tests to match all the parameters. recently russia tested hypersonic variant of its missile successfully but still you cannot induct it in . you need to test a new platform with various parameters in mind sometimes someparameters are met and the test is said successful and sometimes some are not met and its deemed unsuccessful.
also you need to test the missiles in different conditions,eg, inclined platform, vertical platform, maybe the inclined platform test was successful but the vertical launch failed so we need to work on the parameters.
the most important thing is that missiles are tested with various warheads and its performce and accuracy might vary.
with the advent of new enhanced technology we need to upgrade the whole sysytem so we need to do new tests with the new system to try an see if it can be in corporated.sometech might work well with one missile system but when you try to induct it into similar kind of missiles it fails to show similar effects.
i think sir now you can understand very well why it was tested even after 20 tests and i will not be surprised to see further testing.
missiles inducted in the 1980 s are still tried and tested from time to time to check parameters and results of upgrades.
maybe some professional missile expert can give you sir more technical details.
thanks.