@tps77
We have discussed Crotale upgrade before, let me add some points here.
* Crotale's in Pakistani service (2000 and later 4000) reached the limit of OEM offered upgrades with the Crotale 5000. Crotale NG/Mk3 fire a totally different missile with a smaller airframe.
* Crotale uses CLOS guidance, which means the pulse doppler search radar and FCR are prone to jamming.
AESA radars with low level search/detection capability (like Leonardo Kronos Land) could help along with ECCM upgrades to the FCR.
* Pakistan Army inducted the FM-90 in 2015, and the Navy has been using FM-90N on F-22P frigates for sometime, few Pakistani companies (DGMP, IICS, etc) could be contracted to modify the guidance unit of Crotale and with time its Chinese derivatives, just like Ukraine has added a new seeker to missiles fired by the S-125 Pechora.
* Since Pakistan has developed (or acquired) active seeker for the Harbah anti ship missile, using the same technology to upgrade Crotale/FM-90/FM-90N will not only provide experience but also give impetus to development of an indigenous surface to air missile.